Long title | Hazardous Materials Transportation Act of 1975 |
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Acronyms (colloquial) | HMTA |
Enacted by | the 93rd United States Congress |
Effective | January 3, 1975 |
Citations | |
Public law | P.L. 93-633 |
Statutes at Large | 88 Stat. 2156 |
Codification | |
Acts amended | Hazardous Material Transportation Control Act of 1970 |
Titles amended | 49 (Transportation) |
U.S.C. sections created | 49 U.S.C. §§ 5101–5127 |
Legislative history | |
| |
Major amendments | |
The Hazardous Materials Transportation Uniform Safety Act of 1990 Hazardous Materials Transportation Authorization Act of 1994 |
The Hazardous Materials Transportation Act (HMTA), enacted in 1975, is the principal federal law in the United States regulating the transportation of hazardous materials. Its purpose is to "protect against the risks to life, property, and the environment that are inherent in the transportation of hazardous material in intrastate, interstate, and foreign commerce" under the authority of the United States Secretary of Transportation. [1]
The Act was passed as a means to improve the uniformity of existing regulations for transporting hazardous materials and to prevent spills and illegal dumping endangering the public and the environment, a problem exacerbated by uncoordinated and fragmented regulations. [2] Regulations are enforced through four key provisions encompassing federal standards under Title 49 of the United States Code:
Violation of the HMTA regulations can result in civil or criminal penalties, unless a special permit is granted under the discretion of the Secretary of Transportation. [3]
In the 1970s, landfills throughout the United States began to refuse the acceptance of hazardous wastes for the protection of property, the environment, and liability from what would later become known as Superfund sites, which dramatically increased the cost of disposal. [2] The high cost of disposal led to increased dumping of materials that were increasingly being deemed "hazardous" by the public and government. Illegal dumping took place on vacant lots, along highways, or on the actual highways themselves. At the same time, increased accidents and incidents with hazardous materials during transportation was a growing problem, causing damage to property and the environment, injury, and death. [2] [4] At the time, the U.S. Department of Transportation estimated that 75% of all hazardous waste shipments violated existing regulations due to a lack of inspection personnel and poor coordination among the U.S. Coast Guard, the Federal Aviation Administration, the Federal Highway Administration, and the Federal Railroad Administration. [2] The increasing frequency of illegal "midnight" dumping and spills, along with the already existing inconsistent regulations and fragmented enforcement, led to the passing of the Hazardous Materials Transportation Act. It was signed into law on January 3, 1975 by President Gerald Ford, as a means to strengthen the Hazardous Materials Transportation Control Act of 1970 and unify existing regulations.
Since its passage, the HMTA has had two major amendments:
It is estimated that the United States alone makes over 500,000 shipments of hazardous materials every day. [5] More than 90% of these shipments are transported by truck, and anywhere from 5–15% of those trucks are carrying hazardous materials regulated under the HMTA. Approximately 50% of those materials are corrosive or flammable petroleum products, while the remaining shipments represent any of the 2,700 other chemicals considered hazardous in interstate commerce. Accidents that occurred in the transportation of hazardous materials resulted in injury, death, and the destruction of property and the environment. However, the accidents were not limited to the road. The number of incidents regarding hazardous wastes was second in railway accidents behind road accidents. The passage of the HMTA (and its subsequent amendments) has significantly reduced the number of incidents and the gravity of those incidents with hazardous materials in transportation. [4]
The HMTA is one of the eight laws defining the EPA's Emergency Management Program. The other laws comprising the Emergency Management Program include the Clean Air Act (CAA), the Clean Water Act (CWA), the Oil Pollution Act (OPA), the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), Superfund Amendments and Reauthorization Act (SARA), the Emergency Planning and Community Right-to-Know Act (EPCRA), and the Chemical Safety Information, Site Security and Fuels Regulatory Relief Act (CSISSFRRA). [6]
The primary objective of the HMTA is to protect "life, property, and the environment" [1] from the inherent risks of transporting hazardous material, in all major modes of commerce, by improving the regulation and enforcement authority of the Secretary of Transportation. It is in the Secretary's authority to designate material or a group or class of material as hazardous when they meet the definition of hazardous material under the Act.
A hazardous material, as defined by the Secretary, is any particular quantity or form of a material that may pose an unreasonable risk to health and safety or property during transportation in commerce. [7] This includes materials that are explosive, radioactive, infectious, flammable, toxic, oxidizing, or corrosive.
Hazardous wastes and hazardous substances are designated by the U.S. Environmental Protection Agency (EPA). Hazardous wastes are designated under the EPA's Resource Conservation and Recovery Act, while hazardous substances are designated by the Clean Water Act (CWA) and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). [5] The HMTA regulates all essential modes of transportation due to the dangers hazardous materials can present during shipment by ground, air, sea, or any other mode of transportation, such as through a pipeline. [5]
Regulations under the Act are categorized into four key provisions, encompassing federal standards under Title 49 of the United States Code that guide the safe transportation of hazardous materials:
The HMTA specifically states that regulations apply to any person who —
Essentially, all persons involved in the preparation of the transportation of hazardous materials, though the primary burden of liability falls on the shipper of the hazardous materials (the person who offers shipment). Carriers are only required to ensure that required information accompanying hazardous materials packages is immediately available to personnel who would respond to an incident or conduct a hazardous materials investigation, per the amendments enforced in the Hazardous Materials Transportation Uniform Safety Act of 1990. [5]
Regulations are enforced by use of compliance orders, civil penalties, and injunctive relief, [8] under the discretion of the Secretary of Transportation.
As the Act stands now (with its latest amendments), the Department of Transportation (DOT) is most concerned with the test conditions of packages, rather than the transportation conditions. Enforcement includes random packaging inspections by DOT inspectors at freight terminals, intermodal transfer facilities, airports, and other facilities to determine compliance with proper marking and labeling of packaging. DOT also has made it its intent to inspect manufacturing facilities, testing facilities, and shipper's facilities where manufacturing operations occur. [5]
As the current statute stands, the "HMTA (Section 112, 40 U.S.C. 1811) preempts state and local governmental requirements that are inconsistent with the statute, unless that requirement affords an equal or greater level of protection to the public than the HMTA requirement." [5] [8]
The Hazardous Materials Transportation Act is implemented through various agencies based on the mode of transportation and the type of hazardous material being transported:
Enforcement agency | Role in HMTA |
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Research and Innovative Technology Administration (RITA) | Container manufacturing guidelines |
Federal Motor Carrier Safety Administration (FMCSA) | Regulations for motor carriers and highway/road shippers |
Federal Railroad Administration (FRA) | Regulations for rail carriers and rail shippers |
Federal Aviation Administration (FAA) | Regulations for air carriers and air shippers |
United States Coast Guard (USCG) | Regulations for shipment by water and the navigable water shippers (oceans, rivers, etc.) |
Pipeline and Hazardous Materials Safety Administration (PHMSA) | Develops all hazmat regulations enforced by the DOT agencies, Regulations for transportation by pipeline, special permits |
Department of Energy (DOE) | Regulations for radioactive materials |
Atomic Energy Authority (AEA) | Regulations for radioactive materials |
Nuclear Regulatory Commission (NRC) | Regulations for radioactive materials |
Department of Transportation (DOT) | Umbrella that houses most modal agencies which develop or enforce regulations for hazardous materials transportation. Led by the Secretary of Transportation. |
Environmental Protection Agency (EPA) | Regulations for hazardous waste (RCRA) compliance, air & water permitting, hazardous waste cleanup, and more |
Occupational Safety and Health Administration (OSHA) | Regulations to protect workers from acute and chronic exposure and other hazards |
National Fire Protection Association (NFPA) | Regulations for emergency response |
§5117 provides that the Secretary may "issue, modify, or terminate" a special permit authorizing a variance to regulations prescribed under §5103(b), §5104, §5110, or §5112 of the Act [3] to a person performing the functions under §5103(b) in a way that achieves a safety level that —
Special permits are effective for an initial period of no more than 2 years. Renewal of the special permits is granted under the Secretary's discretion upon application for the permit for successive periods of no more than 4 years each. In the case of a special permit relating to §5112, the additional period following permit renewal must be no more than 2 years each.
To apply for a special permit, the applicant must provide a safety analysis prescribed by the Secretary that justifies the special permit, and submit the application to the Administrator of the Pipeline and Hazardous Materials Safety Administration. [9] The Secretary then must publish notice of the application in the Federal Register to give the opportunity for public review and comment. [3]
Upon the applicant's filing of the application, the Secretary must issue, renew, or deny the application within 180 days after the first day of the month following the filing date. If more time is needed, the Secretary must publish a statement to the Federal Register addressing the reason for the delay in the Secretary's decision on the permit, along with an estimate for when the decision will be made. [3]
The Secretary, after completing a review of the circumstance for the permit, and after providing opportunity for public comment and review, must either institute a new rule incorporating the special permit into the regulations of the Act, or publish in the Federal Register the justification for not including the special permit into the regulations. [3]
§5103(b): Regulations for safe transportation prescribed by the Secretary for people who —
§5104: Representation and tampering regulations for a package, component of a package, or packaging intended for the use of transporting hazardous material. [10]
§5110: Shipping papers and disclosure regulations. [11]
§5112: Highway routing of hazardous material regulations. [12]
Under §5123, a person is liable for a civil penalty of up to $75,000 for each violation of a "regulation, order, special permit or approval" of the Act that has been knowingly committed. A separate violation is considered for each day the violation, committed by a person who transports or causes the transportation of a hazardous material, continues. [13] A person acts knowingly when —
Under the discretion of the Secretary, he or she may increase the penalty amount upwards to $175,000 if the violation results in the death, serious illness or injury to any person, or in substantial damage to property. Violations resulting from training activities must be at least $450.
In determining the amount of the civil penalty, the Secretary must consider —
An opportunity for a hearing must be granted to the violator, along with a written notice from the Secretary specifying the amount of the penalty.
A person is subject to a criminal penalty under §5124 if that person knowingly tampers with the labels or packages used for transporting hazardous material, or "willfully or recklessly" violates a "regulation, order, special permit, or approval" under the Act and shall be fined under Title 18 of the United States Code, imprisoned for no more than 5 years, or both. A violation under this section that results in the release of hazardous material causing bodily injury or death to any person can render a maximum prison penalty of 10 years.
Under §5104, tampering refers to the alteration, removal, destruction, or otherwise unlawful tampering of —
A person acts knowingly when —
Knowledge of the existence of a statutory regulation required by the Secretary is not considered an element of offense.
A person acts willfully when —
A person acts recklessly when the person displays a deliberate indifference or conscious disregard to the consequences of that person's conduct.
Procedures on proper handling and preparation for handling hazardous materials, as well as finding out information about implementing the Act (permitting procedures, registration procedures, adding a regulation into the Act, etc.), can be found under this provision.
Under §5106, the Secretary of Transportation may prescribe criteria for handling hazardous material, including—
Under §5107, the hazmat employee training requirements and grants are summarized:
(A) Training requirements— The Secretary shall prescribe by regulation requirements for training that a hazmat employer must give hazmat employees of the employer on the safe loading, unloading, handling, storing, and transporting of hazardous material and emergency preparedness for responding to an accident or incident involving the transportation of hazardous material.
(B) Beginning and completing training— A hazmat employer shall begin the training of hazmat employees of the employer no later than 6 months after the Secretary prescribes the regulations under subsection (a) of this section.
(C) Certification of training— After completing the training, each hazmat employer shall certify, with documentation the Secretary may require by regulation, that the hazmat employees of the employer have received training and have been tested on appropriate transportation areas of responsibility, including at least one of the following:
(D) Coordination of training requirements— In consultation with the Administrator of the Environmental Protection Agency and the United States Secretary of Labor, the Secretary shall ensure that the training requirements prescribed under this section do not conflict with or duplicate—
(E) Training grants—
(F) Training of certain employees— The Secretary shall ensure that maintenance-of-way employees and railroad signalmen receive general awareness and familiarization training and safety training. [15]
Under the Act, transporting hazardous material requires regulations unique to the type of hazardous materials being transported.
The table listing all hazardous materials regulated by the Act for transportation used to be at www.phmsa.dot.gov/staticfiles/PHMSA/DownloadableFiles/Files/Hazmat/Alpha_Hazmat_Table.xls.
This article needs to be updated.(May 2019) |
This table identifies the hazard class of the material to inform specific packaging requirements, [16] or outlines whether the material is forbidden in transportation. [17]
Each person who offers transportation of hazardous materials must describe the material on accompanied shipping papers. The papers must include—
Additionally, the hazardous material must be accompanied by an EPA manifest, a sheet that tracks the transportation of the hazardous material. [18]
Each "package, freight container, and transport vehicle" carrying the hazardous material must have markings that are—
Each non-bulk package, container, or small tank must be labeled with a label code corresponding to the hazard class of the hazardous material being transported, and must follow design and placement requirements. [20]
Each "bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material" must be placarded corresponding to the hazard class of the hazardous material being transported, and must follow design and placement requirements. [21]
Regulations providing for immediate emergency response information in an incident, as well as requirements for the development and implementation of security plans must be adhered by "any person who offers for transportation in commerce or transports in commerce" hazardous materials regulated under the Act. [22]
Packaging requirements under the Act are detailed in Title 49 of the United States Code of Federal Regulations under §173, 178, 179, and 180. Packaging requirements vary based on the hazardous material being transported. [16]
Packaging material must fulfill a set of testing requirements before being authorized to store hazardous materials for transportation to endure the physical stress and environmental changes that may result in phase changes of the packaging contents during transportation. [23]
All packaging provisions under the Act apply to—
Each package must be "designed, constructed, maintained, filled, its contents so limited, and closed" so that during transportation of hazardous contents —
The contents of the package (the hazardous material) and the material of the package itself must be resistant to significant "chemical or galvanic reaction" that can compromise the integrity of the package. Additionally, hazardous materials may not be mixed together with other hazardous or nonhazardous materials creating a reaction causing —
It is up to the shipper of the stored, hazardous material to determine that the compatibility between the hazardous material and the packaging is sufficient for safe transportation. [24]
49 CFR §173: General packaging requirements. [23]
49 CFR §178: Specifications for packagings. [25]
49 CFR §179: Specifications for tank cars. [26]
49 CFR §180: Continuing qualification and maintenance of packagings. [27]
The "operational rules" are the final key provision to the HMTA. They are a summary of the above provisions, including procedures and policies, material designations and labeling, and packaging requirements. Operational rules are covered by 49 CFR §171, 173, 174, 175, 176, and 177 and are all subjective to the U.S. Department of Transportation. Operational rules cover the entire transportation process from pick-up to delivery within all known modes of transportation subject to interstate and intrastate commerce.
49 CFR §171- General information, regulations, and North American shipments
49 CFR §173: Shippers general requirements for shipping and packaging
49 CFR §174: Carriage by rail
49 CFR §175: Carriage by aircraft
49 CFR §176: Carriage by vessel
49 CFR §177: Carriage by public highway [28]
In 1990, Congress enacted the Hazardous Materials Transportation Uniform Safety Act (HMTUSA) in order to clarify the 1975 Hazardous Materials Transportation Act. This amendment sought to standardize international hazardous material transportation requirements as recommended by the United Nations, [16] define preemption over local state regulations that differed from the Act's regulations, and to give more authority to the Secretary of Transportation in requiring registration of hazardous materials. Before the HMTUSA was passed, the Secretary's authority to require registration by all shippers of hazardous materials and by all parties involved in the preparation of shipment (manufacture, repair, testing, or sale) was never exercised. [5]
New provisions under this amendment were designed to "encourage uniformity among different state and local highway routing regulations, to develop criteria for the issuance of federal permits to motor carriers of hazardous materials, and to regulate the transport of radioactive materials." [29]
The amendment also outlined two types of emergency response information:
Under the HMTUSA, the Secretary continues to enforce regulations for the safe transport of hazardous material in intrastate, interstate, and foreign commerce in the same manner as the HMTA. The Secretary also retains authority to classify hazardous materials, when "they pose unreasonable risks to health, safety, or property." [29]
Signed by President Bill Clinton on August 26, 1994, the purpose of the amendment was to broaden the "regulatory and enforcement authority of the Secretary of Transportation." [30] The Secretary is given discretionary power to require anyone who transports hazardous materials through aircraft, rail, ship, or vehicle to register with the Department of Transportation who are not already under mandatory obligation to do so. Additionally, the amendment restructured the Act, reauthorizing funding for the HMTA and requiring additional safety initiatives to be taken by the Department of Transportation. [31] Under this amendment, its underlying goal remained the same as the Hazardous Materials Transportation Act: to protect against the risks to life, property, and the environment during the transportation of hazardous materials.
After the September 11 attacks, Congress considered new security measures to the Act, including background checks for truck drivers, requiring shipping companies to create alternative security plans, the use of electronic tracking devices to pinpoint exact locations of hazardous materials and their transporters, and creating strict federal penalties for hijacking trucks carrying hazardous materials. [31] The enormity of attempting to monitor every shipment in the country was recognized as a "logistical impossibility" and an exorbitant expense. However, on October 18, 2001, Senator Hatch introduced the Hazardous Material in Transportation Protection Act of 2001, which amended the Act to require stricter regulations of issuing operational licenses for the motor-vehicular transportation of hazardous materials. Specifically, the bill prohibits states from issuing licenses to transporters unless the Secretary clears the transporter through a comprehensive background check. [31]
A safety data sheet (SDS), material safety data sheet (MSDS), or product safety data sheet (PSDS) is a document that lists information relating to occupational safety and health for the use of various substances and products. SDSs are a widely used type of fact sheet used to catalogue information on chemical species including chemical compounds and chemical mixtures. SDS information may include instructions for the safe use and potential hazards associated with a particular material or product, along with spill-handling procedures. The older MSDS formats could vary from source to source within a country depending on national requirements; however, the newer SDS format is internationally standardized.
The Resource Conservation and Recovery Act (RCRA), enacted in 1976, is the principal federal law in the United States governing the disposal of solid waste and hazardous waste.
A commercial driver's license (CDL) is a driver's license required in the United States to operate large and heavy vehicles or a vehicle of any size that transports hazardous materials or more than 15 passengers.
Dangerous goods (DG), are substances that when transported are a risk to health, safety, property or the environment. Certain dangerous goods that pose risks even when not being transported are known as hazardous materials. An example for dangerous goods is hazardous waste which is waste that has substantial or potential threats to public health or the environment.
A Federal Firearms License (FFL) is a license in the United States that enables an individual or a company to engage in a business pertaining to the manufacture or importation of firearms and ammunition, or the interstate and intrastate sale of firearms. Holding an FFL to engage in certain such activities has been a legal requirement within the United States since the enactment of the Gun Control Act of 1968. The FFL is issued by the Bureau of Alcohol, Tobacco, Firearms, and Explosives
The Federal Maritime Commission (FMC) is an independent agency of the United States government that regulates U.S. oceanborne transportation and the United States Merchant Marine. It is chaired by Daniel B. Maffei.
Hazardous Waste Operations and Emergency Response is a set of guidelines produced and maintained by the Occupational Safety and Health Administration which regulates hazardous waste operations and emergency services in the United States and its territories. With these guidelines, the U.S. government regulates hazardous wastes and dangerous goods from inception to disposal.
ORM-D was a marking for mail or shipping in the United States. Packages bearing this mark contained hazardous material in a limited quantity that present a limited hazard during transportation, due to its form, quantity, and packaging. ORM-D was phased out by the US Department of Transportation on January 1, 2021.
Right to know is a human right enshrined in law in several countries. UNESCO defines it as the right for people to "participate in an informed way in decisions that affect them, while also holding governments and others accountable". It pursues universal access to information as essential foundation of inclusive knowledge societies. It is often defined in the context of the right for people to know about their potential exposure to environmental conditions or substances that may cause illness or injury, but it can also refer more generally to freedom of information or informed consent.
A Salvage Drum is an outer container used for shipping a leaking, damaged or non-compliant drum containing hazardous materials.
Sensitive security information (SSI) is a category of United States sensitive but unclassified information obtained or developed in the conduct of security activities, the public disclosure of which would constitute an unwarranted invasion of privacy, reveal trade secrets or privileged or confidential information, or be detrimental to the security of transportation. It is not a form of classification under Executive Order 12958 as amended. SSI is not a security classification for national security information. The safeguarding and sharing of SSI is governed by Title 49 Code of Federal Regulations (CFR) parts 15 and 1520. This designation is assigned to information to limit the exposure of the information to only those individuals that "need to know" in order to participate in or oversee the protection of the nation's transportation system. Those with a need to know can include persons outside of TSA, such as airport operators, aircraft operators, railroad carriers, rail hazardous materials shippers and receivers, vessel and maritime port owners and operators, foreign vessel owners, and other persons.
The HAZMAT Class 2 in United States law includes all gases which are compressed and stored for transportation. Class 2 has three divisions: Flammable, Non-Flammable/Non-Poisonous, and Poisonous. This classification is based on the United Nations' Recommendations on the Transport of Dangerous Goods - Model Regulations. In Canada, the Transportation of Dangerous Goods Regulations, or TDGR, are also based on the UN Model Regulations and contain the same three divisions.
Hazmat Class 1 are explosive materials which are any substance or article, including a device, which is designed to function by explosion or which, by chemical reaction within itself is able to function in a similar manner even if not designed to function by explosion.
In the United States, driver's licenses are issued by each individual state, territory, and the District of Columbia rather than by the federal government due to federalism. Drivers are normally required to obtain a license from their state of residence. All states of the United States and provinces and territories of Canada recognize each other's licenses for non-resident age requirements. There are also licenses for motorcycle use. Generally, a minimum age of 15 is required to apply for a non-commercial driver license, and 25 for commercial licenses which drivers must have to operate vehicles that are too heavy for a non-commercial licensed driver or vehicles with at least 16 passengers or containing hazardous materials that require placards. A state may also suspend an individual's driving privilege within its borders for traffic violations. Many states share a common system of license classes, with some exceptions, e.g. commercial license classes are standardized by federal regulation at 49 CFR 383. Many driving permits and ID cards display small digits next to each data field. This is required by the American Association of Motor Vehicle Administrators' design standard and has been adopted by many US states. The AAMVA provides a standard for the design of driving permits and identification cards issued by its member jurisdictions, which include all 50 US states, the District of Columbia, and Canadian territories and provinces. The newest card design standard released is the 2020 AAMVA DL/ID Card Design Standard (CDS). The AAMVA standard generally follows part 1 and part 2 of ISO/IEC 18013-1. The ISO standard in turn specifies requirements for a card that is aligned with the UN Conventions on Road Traffic, namely the Geneva Convention on Road Traffic and the Vienna Convention on Road Traffic.
Hours of service (HOS) regulations are issued by the Federal Motor Carrier Safety Administration (FMCSA) and govern the working hours of anyone operating a commercial motor vehicle (CMV) in the United States. These regulations apply to truck drivers, commercial and intercity bus drivers, and school bus drivers who operate CMVs. These rules limit the number of daily and weekly hours spent driving and working, and regulate the minimum amount of time drivers must spend resting between driving shifts. For intrastate commerce, the respective state's regulations apply.
In the United States, several federal agencies and laws have some jurisdiction over pollution from ships in U.S. waters. States and local government agencies also have responsibilities for ship-related pollution in some situations.
The UN Recommendations on the Transport of Dangerous Goods are contained in the UN Model Regulations prepared by the Subcommittee of Experts on the Transport of Dangerous Goods of the United Nations Economic and Social Council (ECOSOC). They cover the transport of dangerous goods by all modes of transport except by bulk tanker. They are not obligatory or legally binding on individual countries, but have gained a wide degree of international acceptance: they form the basis of several international agreements and many national laws.
Waste management laws govern the transport, treatment, storage, and disposal of all manner of waste, including municipal solid waste, hazardous waste, and nuclear waste, among many other types. Waste laws are generally designed to minimize or eliminate the uncontrolled dispersal of waste materials into the environment in a manner that may cause ecological or biological harm, and include laws designed to reduce the generation of waste and promote or mandate waste recycling. Regulatory efforts include identifying and categorizing waste types and mandating transport, treatment, storage, and disposal practices.
Pesticide regulation in the United States is primarily a responsibility of the Environmental Protection Agency (EPA). In America, it was not till the 1950s that pesticides were regulated in terms of their safety. The Pesticides Control Amendment (PCA) of 1954 was the first time Congress passed guidance regarding the establishment of safe limits for pesticide residues on food. It authorized the Food and Drug Administration (FDA) to ban pesticides they determined to be unsafe if they were sprayed directly on food. The Food Additives Amendment, which included the Delaney Clause, prohibited the pesticide residues from any carcinogenic pesticides in processed food. In 1959, pesticides were required to be registered.
In rail transport, the U.S. DOT-111 tank car, also known as the TC-111 in Canada, is a type of unpressurized general service tank car in common use in North America. Tank cars built to this specification must be circular in cross section, with elliptical, formed heads set convex outward. They have a minimum plate thickness of 7⁄16 inch (11.1 mm) and a maximum capacity of 34,500 US gallons. Tanks may be constructed from carbon steel, aluminum alloy, high alloy steel, or nickel plate steel by fusion welding.