Vehicle activated sign (VAS) is a generic term for a type of road traffic sign which displays a message conditional upon the presence, or speed, of a road vehicle. The devices are deployed on roadsides like regular traffic signs in various countries. They are intended to help drivers by alerting them and drawing attention to danger or other undesirable situation.
These signs activate if an approaching vehicle is detected to be exceeding a preset speed threshold. The speed limit and/or a warning message will illuminate on the sign to remind the driver/rider to slow down.
Another variation of VAS displays the speed of any passing vehicle. If the vehicle is moving faster than the speed limit the number will flash, or be displayed in an alternate colour. Other signs also flash alternately between a number indicating the speed and an emoticon. A Smiley face is displayed if the vehicle is moving below the speed limit, while a sad face is displayed when the limit is being exceeded. This kind of VAS is widely deployed in the Netherlands and Belgium.[ citation needed ]
These signs are installed on the approaches to hazards such as bends and junctions. If triggered they may display a warning message and/or an image of the appropriate road sign (sharp bend, junction, overheight warning, etc.).
Sydney, Australia has implemented a unique low-clearance hazard warning using a curtain of water directly in the path of the vehicle. "When a truck gets too close ... a curtain of water starts flowing and a stop sign is projected onto it. The result is a warning that's so in-your-face that not only do the trucks stop, but so do all of the cars around it." [1]
Vehicle activated signs used on the public highways are normally designed to mirror the standard road traffic signs and in the UK to the TSR&GD standards, these signs should also be designed to EN12966:2014 to ensure the signs are fit for use on the public highways.
In a 2002 study [2] conducted by TRL for the UK Department for Transport one of the conclusions was that vehicle activated signs appear to be very effective in reducing speeds; in particular, they are capable of reducing the number of drivers who exceed the speed limit and who contribute disproportionately to the accident risk, without the need for enforcement such as speed cameras.
A variable-message sign or message board, often abbreviated VMS, VMB, CMS, or DMS, and in the UK known as a matrix sign, is an electronic traffic sign often used on roadways to give travelers information about special events. Such signs warn of traffic congestion, accidents, incidents such as terrorist attacks, AMBER/Silver/Blue Alerts, roadwork zones, or speed limits on a specific highway segment. In urban areas, VMS are used within parking guidance and information systems to guide drivers to available car parking spaces. They may also ask vehicles to take alternative routes, limit travel speed, warn of duration and location of the incidents, inform of the traffic conditions, or display general public safety messages.
A warning sign is a type of sign which indicates a potential hazard, obstacle, or condition requiring special attention. Some are traffic signs that indicate hazards on roads that may not be readily apparent to a driver.
Road signs in the United Kingdom and in its associated Crown dependencies and overseas territories conform broadly to European design norms, though a number of signs are unique: direction signs omit European route numbers and road signs generally use the Imperial System of units, unlike the rest of Europe. Signs in Wales and parts of Scotland are bilingual.
Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users. A sub-type of emergency vehicle equipment, emergency vehicle lighting is generally used by emergency vehicles and other authorized vehicles in a variety of colors.
Road signs in Sweden are regulated in Vägmärkesförordningen, VMF (2007:90), and are to be placed 2 metres from the road with the sign 1.6 m from the base for motorized roads. Except for route numbers, there are a maximum of three signs on a pole, with the most important sign at the top. All signs have a reflective layer added on selected parts of the sign as is custom in European countries; most larger signs also have their own illumination.
Road signs in Singapore closely follow those laid down in the traffic sign regulations used in the United Kingdom, although a number of changes over the years have introduced some slight deviations that suit local road conditions. Road signs in Singapore conform to the local Highway Code under the authority of the Singapore Traffic Police.
A radar speed sign is an interactive sign, generally constructed of a series of LEDs, that displays vehicle speed as motorists approach. The purpose of radar speed signs is to slow cars down by making drivers aware when they are driving at speeds above the posted limits. They are used as a traffic calming device in addition to or instead of physical devices such as speed bumps and rumble strips.
An advisory speed limit is a speed recommendation by a governing body, used when it may be non-obvious to the driver that the safe speed is below the legal speed. It is a posting which either approximates the Basic Speed Law or rule or is based on a maximum g-force exerted at a specific speed. Advisory speed limits are often set in areas with many pedestrians, such as in city centres and outside schools, and on difficult stretches of roads, such as on tight corners or through roadworks. While travelling above the advisory speed limit is not illegal per se, it may be negligence per se and liability for any collisions that occur as a result of traveling above the limit can be placed partially or entirely on the person exceeding the advisory speed limit.
Road signs in Thailand are standardized road signs similar to those used in other nations but much of it resembles road signage systems used in South American countries with certain differences, such as using a blue circle instead of a red-bordered white circle to indicate mandatory actions. Until the early 1980s, Thailand closely followed American, European, Australian, and Japanese practices in road sign design, with diamond-shaped warning signs and circular restrictive signs to regulate traffic. For Romanized, signs usually use the FHWA Series fonts typeface, which is also used on American road signage, but for Thai text, the font used is unknown.
Courtesy lights are used to request right-of-way primarily by volunteer or on-call firefighters emergency medical technicians (EMTs), and other first responders to expedite their response in their privately owned vehicles, to their firehouse, base, or directly to the scene of an emergency call. Courtesy lights sometimes allow the user to disobey traffic laws such as speed limits, but usually not laws applying to stop signs or stop lights. Courtesy lights should not be confused with emergency warning lights used in conjunction with audible warning systems (sirens) for emergency vehicles such as police cars, fire apparatus, ambulances, etc, nor should they be confused with warning lights as used by tow trucks, snow plows, construction vehicles and school buses to increase awareness especially when moving slowly or stopped in the roadway.
A move over law is a law which requires motorists to move over and change lanes to give safe clearance to law enforcement officers, firefighters, ambulances, utility workers, and in some cases, tow-truck drivers and disabled vehicles. In the past, Canada and United States have used this term to apply to two different concepts; however, this is beginning to change as Canadian provinces have begun expanding the scope of their move over laws.
In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
Road signs in India can vary in design, depending on the location. For most part, they tend to closely follow European practices, usually identical with the United Kingdom or the Vienna Convention on Road Signs and Signals, although yellow rectangular signs that do carry such messages like "Be gentle on my curves" and "Danger creeps when safety sleeps" are present nationwide. Road signs in India are metric.
Traffic signs, installations, and symbols used in Germany are prescribed by the Road Traffic Regulations (StVO) and the Traffic Signs Catalog (VzKat).
Road traffic control devices are markers, signs and signal devices used to inform, guide and control traffic, including pedestrians, motor vehicle drivers and bicyclists. These devices are usually placed adjacent, over or along the highways, roads, traffic facilities and other public areas that require traffic control.
Terminology related to road transport—the transport of passengers or goods on paved routes between places—is diverse, with variation between dialects of English. There may also be regional differences within a single country, and some terms differ based on the side of the road traffic drives on. This glossary is an alphabetical listing of road transport terms.
Road signs in Cambodia are standardized road signs are similar to those used in Europe but much of it resembles road signage systems used in South American countries with certain differences. The designs of road signage match their neighbours of Thailand and Malaysia, both of which adopt a modified version of the South American road signage system. Until the early 1980s, Cambodia closely followed American, European, Australian, and Japanese practices in road sign design, with diamond-shaped warning signs and circular restrictive signs to regulate traffic. Unlike Thailand and Malaysia, Cambodia does not use the FHWA Series fonts typeface, favouring Helvetica instead.
Road signs in Lithuania ensure that transport vehicles move safely and orderly, as well as to inform the participants of traffic built-in graphic icons. These icons are governed by the Vienna Convention on Road Traffic and Vienna Convention on Road Signs and Signals.
Road signs in the Philippines are regulated and standardized by the Department of Public Works and Highways (DPWH). Most of the signs reflect minor influences from US and Australian signs but keep a design closer to the Vienna Convention on Road Signs and Signals, to which the Philippines is an original signatory.
Road signs in South Africa are based on the SADC-Road Traffic Sign Manual, a document designed to harmonise traffic signs in member states of the Southern Africa Development Community. Most of these signs were in the preceding South African RTSM.