![]() | The examples and perspective in this article deal primarily with North America and Europe and do not represent a worldwide view of the subject.(January 2024) |
A stroad is a type of street–road hybrid. [1] [2] [3] [4] Common in the United States and Canada, stroads are wide arterials (like a road) that often provide access to strip malls, drive-throughs, and other automobile-oriented businesses (like a street). [5] Stroads have been criticized by urban planners for their safety issues and inefficiencies. While streets serve as a destination and provide access to shops and residences at safe traffic speeds, and roads serve as a high-speed connection that can efficiently move traffic at high speed and volume, stroads are often expensive, inefficient, and dangerous. [6] [7] [8]
In 2011, the American civil engineer and urban planner Charles Marohn, founder of Strong Towns, coined the word "stroad" as a blend of the words street and road to illustrate what he characterized as failures in the North American pattern of development. [4] [9] [10]
According to Charles Marohn, a stroad is a bad combination of two types of vehicular pathways: it is part street—which he describes as a "complex environment where life in the city happens", with pedestrians, cars, buildings close to the sidewalk for easy accessibility, with many (property) entrances / exits to and from the street, and with spaces for temporary parking and delivery vehicles—and part road, which he describes as a "high-speed connection between two places" with wide lanes and limited entrances and exits, and which are generally straight or have gentle curves. [11]
In essence, Marohn defines a stroad as a high-speed road with many turnoffs, and lacking in safety features. [12] [11] In his commentary, Marohn states that stroads do not function well as either a street or a road. [13] According to Marohn, the problem with stroads is that engineering codes tend to emphasize speed and traffic flow rather than safety, so that stroads try to be "all things to all people" but end up failing in every way as a result. [10] [14]
Dover and Massengale (2014) stated that the design of roads as highways/motorways was originally modelled on the railroad, namely an efficient connection between two populated places (cities, towns, villages) with a car, while streets formed networks inside a place to move around that place with numerous different modes of transportation to make it financially productive; these two systems functioned well as long they were kept separated, [15]
But when we reconfigure our streets to have the characteristics of roads—as stroads—we are no longer able to capture the value of shar[ing] the space. A modern stroad ... is about the least safe traffic environment you could be in, too, with high-speed designs mashed up with turning traffic, stop-and-go traffic, sudden lane changes, and obnoxious signage. This ridiculously unsafe design is accepted as "normal" just because it was allowed to become ubiquitous. [15]
They noted that the general public is often not aware of the functional distinction that engineers (as well as dictionaries) make between streets and roads, that street names ending with 'street' or 'road' (for historical reasons) may be misleading and not align with the current de facto traffic situation, and that mixing up the functions of streets and roads causes numerous problems. [16]
The concept of the stroad was popularized in large part as a result of an April 2021 short documentary by the Canadian-born Amsterdam-based Jason Slaughter of the urban planning YouTube channel Not Just Bikes, which went viral, and [11] [17] : 1:02 stated that stroads in North America are "ugly, dangerous, and inefficient", as well as more expensive, contrasting them with road design in the Netherlands, where clear functional distinctions between motorways (highways), roads, and streets were introduced in the 1990s. [18] These measures were aimed at increasing safety, traffic flow, and cost-effectiveness, while also having the effect of reducing car dependency, increasing walkability, cycleability, and general livability. [18] Unlike the two functions ("street" versus "road") proposed by Marohn's foundation Strong Towns, [19] the Dutch Institute for Road Safety Research (Dutch : Stichting Wetenschappelijk Onderzoek Verkeersveiligheid (SWOV), lit. 'Foundation (for the) Scientific Study (of) Traffic Safety') identified three functions for roadways in 1994: flow, distribution, and access. [20] [18]
The redesigning of roads in the Netherlands into these three functions, as part of the Dutch Sustainable Safety Vision, resulted in a 30% decrease in expected traffic deaths between 1998 and 2007. [21] Zurborg argued that stroads in the United States are the result of local governments designing their roadways to fulfill all three functions simultaneously, thus leading to numerous problems. [26]
In some cases, roads become stroads due to a lack of access management implementation when facilities are expanded or widened, often with the aim of improving mobility. The road becomes a stroad over time from development adding private accessways onto the main road, increasing congestion and collisions, which thus requires traffic control additions such as traffic signals. This degrades the roadway quality in terms of mobility. [27]
According to Charles Marohn, the famous Champs-Élysées in Paris was effectively a stroad as recently as 2001. In the middle of the avenue were three automobile traffic lanes in either direction, ostensibly fulfilling the function of a road. A wide buffer of trees existed on either side of the road area, separating the roadway from slip lanes for slow-driving traffic. These slip lanes fulfilled the function of streets, providing access to parking, sidewalks, shops and restaurants. Because the street and road areas of the Champs-Élysées were physically separated, this stroad environment actually managed some success in allowing both safe high-speed traffic (up to 45 miles per hour (72 km/h)) in the center roadway and a productive street environment on the sides. As of 2019 [update] however, the slip lanes are fully pedestrianized, while the center roadway functions as a true road. [28] [10] : 12:01
The Esplanade in Chico, California is, according to Marohn, a rare example of a successful 'stroad' akin to the 2001 version of the Parisian Champs-Élysées in that buffers of trees physically separate the high-speed 'road' part in the middle from the two low-speed productive 'streets' on the sides (lined by houses which had high property values). [29] He contrasted the Esplanade to Mangrove Avenue, a stroad just five blocks to the east in Chico that runs parallel to the Esplanade, but has all the typical issues of a stroad in that the street and road functions are not physically separated, and the environment is low-density and much less productive, with gas stations, strip malls and other car-oriented businesses. [29]
Unlike Marohn, however, Jason Slaughter of Not Just Bikes does not categorize such traffic situations as a "stroad", but as "a road with streets on either side to access houses". [30] Taking the Nieuwe Dedemsvaartweg (Provincial road N377) outside Nieuwleusen and the Keizer Karelweg (s108) in Amstelveen in the Netherlands as examples, he used the fact that access from the middle to the sides is very restricted (through a limited number of roundabouts) to argue that they are three separate ways: the middle is a road, the sides are streets; there is no "stroad". [note 1] [note 2]
Stroads do not account for human psychology. [33] Vision Zero Coalition's 2018 report explained that since the stroad has a false sense of safety, drivers subconsciously drive at dangerously fast speeds. [34] Stroads in the USA and Canada typically have legal speed limits between 30 and 45 miles per hour (48 and 72 km/h). But since the speed limit usually does not match the design speed, motorists usually drive 20 to 55 miles per hour (32 to 89 km/h) on stroads. [35] Therefore, simply reducing the posted speed limit (PSL) with a traffic sign, a widely adopted strategy, will not work. "If the road [design] ... suggest[s] that the PSL is too low, drivers may simply ignore it". [33]
To help people comply with the legal speed limit, traffic engineers need to design roads, (stroads,) and streets so that they are self-explanatory. [36] This is called traffic calming. Roads and streets that use traffic calming use physical and perceptual cues to subconsciously trigger drivers to drive slower and more cautiously due to perceived danger. [37] Examples include "narrower lanes, tighter corner radii, gateway treatments, changed roadway surface materials and appearance, mini roundabouts and other speed management techniques" such as speed bumps. [37] The typical lack of these cues on stroads causes motorists to drive much faster than is safe to do in the environment they are in, with many entries and exits creating points of conflict and potential collisions, especially at higher speeds. [37] [note 3]
Traffic engineers in cities around North America (e.g. Boston, [34] Houston, [40] St. Louis, [10] etc.) are reshaping their fundamental street design (and laws) so that safety is prioritized. As of 2019 [update] , the city of Boston is studying how to minimize pedestrian traffic deaths by lowering speed limits with traffic calming using road diets. After several stroads were replaced by more efficient roadways in Boston, vehicular fatalities fell from 21 in 2016 to 10 in 2018; simultaneously, pedestrian fatalities halved from 14 to 7. [41] This partial success motivated Bostonian locals to demand the complete elimination of the remaining stroads by implementing better road design. [41]
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Stroads often lack features designed to make roadways safe for pedestrians, such as crosswalks and adequate street lights. A 2021 report by the Governors Highway Safety Association said that 60.4% of pedestrian fatalities from motor vehicles occurred on such roads. [42]
Although stroads facilitate the goal of making all destinations reachable by car, they also practically force everyone to use (and own) a car, and thus increase car dependency (at the cost of walkability and easy use of public transport), while not necessarily making travelling by car more efficient. [14] [8] Despite the high speeds that stroads were designed for, which has made them needlessly dangerous, in practice they frequently end up being clogged with cars seeking access from the many entrances, so that the average speeds on stroads are low due to traffic congestion. [14] Widening stroads to counter congestion usually only leads to induced demand and extra costs. [8]
The quality of sidewalks (British English: pavement) next to stroads is often poor. Many stroads do not feature any sidewalks at all. [43] [44] In the case of stroad-like suburban residential streets, sidewalks are sometimes deliberately left out by design in order "to further the rural image". [14] Whereas stroads often feature a repetitive pattern of retail franchises on the side with very few sidewalks for pedestrians, there are usually large parking spaces for drivers. [45] [44] Sometimes there are only "painted sidewalks" next to a strip mall, without curbs or traffic bollards to somewhat protect pedestrians against vehicles that may deviate from the road. [46]
Marohn (2021) stated: "A person on a sidewalk has no defense at all if a vehicle leaves the roadway at stroad speeds". [47] He pointed out that traffic lights, such as those next to the State Street stroad in Springfield, Massachusetts, are often designed with shear pins at the base so as to break off if a vehicle happens to crash into it; although this design increases the safety of the driver and any passengers, it also significantly decreases the safety of any pedestrians who may be standing or walking on the sidewalk behind the traffic signal. [48] Marohn was astonished to discover that even a bench had been placed right next to this breakaway traffic light pole, "inviting people to sit in a place where the chance of a driver losing control and going off the roadway at high speeds is so great that the city installed breakaway poles." [48] At intersecting stroads, vehicles often need to decelerate from a high to a low speed to make a sharp turn right at a long turn lane next to a sidewalk; this makes walking there particularly dangerous for pedestrians. [17] : 1:35 Sidewalks are sometimes too narrow, feature many obstructions such as street lights, as well as driveway cuts, which make them pedestrian-unfriendly. [17] : 4:35
Middleton (2021) called stroads 'a combination of a people-centric street and a vehicle-centric road'. [44] The stroad can be found where urban sprawl and car-centric development patterns are used: it 'seems confused', and is characterized by 'no sidewalk, no shade, and a lot of parking'. [44] In Lexington, Kentucky, where such situations are commonly found in modern suburban commercial areas, a survey of elderly residents found that respondents instead desired 'protection from traffic, reduced noise, seating and shade, dedicated sidewalks, and increased building frontage.' [44]
Walking for a distance of 800 metres (2,600 ft) along a stroad (Farm to Market Road 1960 or Cypress Creek Parkway) in Houston was what motivated Jason Slaughter of Not Just Bikes to wonder who could have possibly designed such a situation, and how urban planning could be done much safer and more efficiently (by improving walkability and reducing car dependency). [49] : 7:40 [50] : 4:30, 7:25 The rather narrow sidewalks, and in the middle section (crossing a bridge and a railroad) no sidewalk at all, were right next to fast-driving vehicular traffic (c.80 to 100 kilometres per hour (50 to 62 mph), creating an extremely unsafe and unpleasant environment for pedestrians. [49] : 8:36 [50] : 6:03 Yet, the fact that the grass where one would expect a sidewalk was well-trodden, and Google Street View images also showed that people used it, was evidence to Slaughter that a significant number of pedestrians apparently saw or had no other option (such as taking a car, taxi or bus) than to walk along this dangerous stroad to get to their destinations without basic pedestrian protections. [50] : 6:03, 9:14 He argued: "There is no excuse for this. If you have enough room for 7 lanes of car traffic, then you have enough room for a sidewalk. Or a bicycle path." [50] : 9:34
Marohn (2017) stated that stroads "are enormously expensive to build and, ultimately, financially unproductive". [37] This is because "stroads are built to a highway standard, their lanes are very wide, and there are never [fewer] than four lanes", [51] or "at least three through lanes", [17] : 1:49 and they usually take up extra space for shoulders and clear zones. [52] Stroads feature many more entrances and exits than limited-access highways and roads and thus require more turning lanes, and because stroad vehicle speeds may be higher than on a street, the turning lanes are much longer to allow vehicles to decelerate and reduce the risk of rear-end collisions; this means stroads require more and longer turning lanes, which are more expensive to build and maintain and take up more space than streets and roads do. [53] [17] : 3:10 The high frequency of accesses to a stroad with much traffic often prompts the construction of traffic lights at intersections, which may cost up to $250,000 to build (excluding maintenance costs). [53]
An extreme example of this is found on the intersection of Charleston Boulevard with Decatur Boulevard in Las Vegas, which features seven approach lanes, each of which has traffic lights. [17] : 2:08 The larger size of stroads compared to streets and roads means they require more space which needs to be purchased, flattened and asphalted, which reduces the property value of the land, increases the cost of flood protection infrastructure, and asphalt and traffic control system maintenance costs. [54] Compared to households along urban streets, stroads tend to double the costs that households pay on the construction and maintenance of infrastructure, as well as the delivery of public services, while the tax revenues per acre of properties along stroads pale in comparison to urban commercial streets. [14] [55]
The space taken up by stroads, as well as the large areas dedicated to parking lots at the destinations of cars using stroads, result in low-density land use (typical for urban sprawl). [56] This makes stroad environments financially significantly less productive and tax-generating than a street, but with significantly more infrastructure and thus high-cost per area maintenance costs, so that they become a net-negative and financial burden for cities, because they cannot sustain themselves. [57]
Arguing that stroads represent a poor return on investment and safety hazard, Charles Marohn suggested that stroads should either be converted to a street, for land access, or a road, for mobility. Conversion to a street would involve slowing traffic, prioritizing people over cars, and encouraging complex community interactions and solution. Conversion to a road would involve separating the road from shops, reducing the number of access roads. The Champs-Élysées with its slip lanes is given as example of one such conversion. [58]
Author Korawich Kavee has described Highway 3214 [ th ] in Thailand as a stroad. [66]
Traffic comprises pedestrians, vehicles, ridden or herded animals, trains, and other conveyances that use public ways (roads/sidewalks) for travel and transportation.
A sidewalk or pavement is a path along the side of a road. Usually constructed of concrete, pavers, brick, stone, or asphalt, it is designed for pedestrians. A sidewalk is normally higher than the roadway, and separated from it by a curb. There may also be a planted strip between the sidewalk and the roadway and between the roadway and the adjacent land.
A roundabout, a rotary and a traffic circle are types of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction.
A pedestrian is a person traveling on foot, whether walking or running. In modern times, the term usually refers to someone walking on a road or pavement, but this was not the case historically. Pedestrians may also be wheelchair users or other disabled people who use mobility aids.
Traffic calming uses physical design and other measures to improve safety for motorists, car drivers, pedestrians and cyclists. It has become a tool to combat speeding and other unsafe behaviours of drivers. It aims to encourage safer, more responsible driving and potentially reduce traffic flow. Urban planners and traffic engineers have many strategies for traffic calming, including narrowed roads and speed humps. Such measures are common in Australia and Europe, but less so in North America. Traffic calming is a calque of the German word Verkehrsberuhigung – the term's first published use in English was in 1985 by Carmen Hass-Klau.
Level of service (LOS) is a qualitative measure used to relate the quality of motor vehicle traffic service. LOS is used to analyze roadways and intersections by categorizing traffic flow and assigning quality levels of traffic based on performance measure like vehicle speed, density, congestion, etc. In a more general sense, levels of service can apply to all services in asset management domain.
Road traffic safety refers to the methods and measures, such as traffic calming, to prevent road users from being killed or seriously injured. Typical road users include pedestrians, cyclists, motorists, passengers of vehicles, and passengers of on-road public transport, mainly buses and trams.
In road transport, a lane is part of a roadway that is designated to be used by a single line of vehicles to control and guide drivers and reduce traffic conflicts. Most public roads (highways) have at least two lanes, one for traffic in each direction, separated by lane markings. On multilane roadways and busier two-lane roads, lanes are designated with road surface markings. Major highways often have two multi-lane roadways separated by a median.
Bicycle law in California is the parts of the California Vehicle Code that set out the law for persons cycling in California, and a subset of bicycle law in the United States. In general, almost all the same rights and responsibilities that apply to car drivers apply to bicycle riders as well.
Queens Boulevard is a major thoroughfare connecting Midtown Manhattan, via the Queensboro Bridge, to Jamaica in Queens, New York City, United States. It is 7.5 miles (12.1 km) long and forms part of New York State Route 25.
Vehicular cycling is the practice of riding bicycles on roads in a manner that is in accordance with the principles for driving in traffic. The phrase vehicular cycling was coined by John Forester in the 1970s. In his book Effective Cycling, Forester contends that "Cyclists fare best when they act and are treated as drivers of vehicles".
A road diet is a technique in transportation planning whereby the number and/or the width of travel lanes of the road is reduced, often to achieve a reduction in crash rates.
A road is a thoroughfare, route, or way on land between two places that has been surfaced or otherwise improved to allow travel by foot or some form of conveyance, including a motor vehicle, cart, bicycle, or horse. Roads have been adapted to a large range of structures and types in order to achieve a common goal of transportation under a large and wide range of conditions. The specific purpose, mode of transport, material and location of a road determine the characteristics it must have in order to maximize its usefulness. Following is one classification scheme.
Complete streets is a transportation policy and design approach that requires streets to be planned, designed, operated and maintained to enable safe, convenient and comfortable travel and access for users of all ages and abilities regardless of their mode of transportation. Complete Streets allow for safe travel by those walking, cycling, driving automobiles, riding public transportation, or delivering goods.
The design speed is a tool used to determine geometric features of a new road or street during road design. Contrary to the word's implication, the design speed of the road or street is not necessarily its vehicle speed limit or maximum safe speed; that can be higher or lower.
The geometric design of roads is the branch of highway engineering concerned with the positioning of the physical elements of the roadway according to standards and constraints. The basic objectives in geometric design are to optimize efficiency and safety while minimizing cost and environmental damage. Geometric design also affects an emerging fifth objective called "livability", which is defined as designing roads to foster broader community goals, including providing access to employment, schools, businesses and residences, accommodate a range of travel modes such as walking, bicycling, transit, and automobiles, and minimizing fuel use, emissions and environmental damage.
Cycling infrastructure is all infrastructure cyclists are allowed to use. Bikeways include bike paths, bike lanes, cycle tracks, rail trails and, where permitted, sidewalks. Roads used by motorists are also cycling infrastructure, except where cyclists are barred such as many freeways/motorways. It includes amenities such as bike racks for parking, shelters, service centers and specialized traffic signs and signals. The more cycling infrastructure, the more people get about by bicycle.
A protected intersection or protected junction, also known as a Dutch-style junction, is a type of at-grade road junction in which cyclists and pedestrians are separated from cars. The primary aim of junction protection is to help pedestrians and cyclists be and feel safer at road junctions.
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.
There is debate over the safety implications of cycling infrastructure. Recent studies generally affirm that segregated cycle tracks have a better safety record between intersections than cycling on major roads in traffic. Furthermore, cycling infrastructure tends to lead to more people cycling. A higher modal share of people cycling is correlated with lower incidences of cyclist fatalities, leading to a "safety in numbers" effect though some contributors caution against this hypothesis. On the contrary, older studies tended to come to negative conclusions about mid-block cycle track safety.
A "stroad" is a street/road hybrid that fails to boost value—a street's purpose—or move traffic quickly—a road's job. Or, as Marohn jokes: "It's the futon of transportation."
Urban planning critic says the U.S. should build streets for people to live, and roads to move traffic quickly
...A stroad being a car corridor that isn't smart enough to be a street nor efficient enough to be a road. ...
...The worst-designed roads in America are our stroads, a term coined by engineer Charles Marohn of Strong Towns to denote trafficways that try to be both roads (moving traffic quickly from one destination to another) and streets (centers of productive human activity). ...
engineering codes prioritize speed and traffic flow over safety ... Marohn is known for coining the term "stroad" ... Stroads try to be all things to all people and generally end up failing on all levels as a result.
Lawlor said stroads can be found on stretches of Tremont, Charles, and Beacon Streets in Boston. Fairchild said the design of stroads — straight thoroughfares with multiple lanes...
...Behavior is contextual, any sociologist will tell you, and the entire context of the Sun Belt, with its stroads, its SUVS, and its politics of scarcity, is the issue...
A stroad is the worst of both worlds, and is incredibly dangerous to pedestrians. The data bears this out: In 2021, the latest GHSA report says, 60.4 percent of pedestrian fatalities happened on such roads, which often lack infrastructure that would make it safe for pedestrians, such as good lighting and frequent crosswalks.
A stroad tries to move cars quickly along a corridor of a community. The result is expensive infrastructure serving low-returning properties. A stroad is the worst kind of transportation investment yet, they plague much of the American landscape.