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 , , Driving, passengers of vehicles, and passengers of on-road public transport, mainly and .
Best practices in modern road safety strategy:
As sustainable solutions for classes of road safety have not been identified, particularly low-traffic rural and remote roads, a hierarchy of control should be applied, similar to classifications used to improve occupational safety and health. At the highest level is sustainable prevention of serious injury and death crashes, with sustainable requiring all key result areas to be considered. At the second level is real-time risk reduction, which involves providing users at severe risk with a specific warning to enable them to take mitigating action. The third level is about reducing the crash risk which involves applying the road-design standards and guidelines (such as from AASHTO), improving driver behavior and enforcement. It is important to note that drivers' traffic behaviors are significantly influenced by their perceptions and attitudes.
Traffic safety has been studied as a science for more than 75 years.
The standard measures used in assessing road safety interventions are fatalities and killed-or-seriously-injured (KSI) rates, usually expressed per billion (109) passenger kilometres. Countries using older road-safety paradigmsKSI league tables replace KSI rates with crash rates – for example, crashes per million vehicle-miles.
Vehicle speed within the human tolerances for avoiding serious injury and death is a key goal of modern road-design, because impact speed affects the severity of injury both to vehicle occupants and to pedestrians. For occupants, Joksch (1993) found the probability of death for drivers in multi-vehicle collisions increased as the fourth power of impact speed (often referred to by the mathematical term δv ("delta V"), meaning change in velocity). Injuries are caused by sudden, severe acceleration (or deceleration); this is difficult to measure. However, crash reconstruction techniques can estimate vehicle speeds before a crash. Therefore, the change in speed is used as a surrogate for acceleration. This enabled the Swedish Road Administration to identify the KSI risk curves using actual crash-reconstruction data which led to the human tolerances for serious injury and death referenced above.
Interventions are generally much easier to identify in the modern road-safety paradigm, which focusses on the human tolerances for serious injury and death. For example, the elimination of head-on KSI crashes simply required the installation of an appropriate median crash-barrier. Also, roundabouts, often with speed-reducing approaches, feature very few KSI crashes.
The old road-safety paradigm of purely crash risk is a far more complex matter. Contributing factors to highway crashes may be related to the driver (such as driver error, illness, or fatigue), the vehicle (brake, steering, or throttle failures), or the road itself (lack of sight distance, poor roadside clear- zones, etc.). Interventions may seek to reduce or compensate for these factors, or to reduce the severity of crashes. A comprehensive outline of interventions areas can be seen in management systems for road safety. Study conducted in Finland revealed that the fatality risk is increased most when a collision type is either pedestrian or meeting of the vehicles.Sirvio, Konsta; Hollmén, Jaakko. PIARC Paris 23rd World Road Congress: Exploratory Analysis
In addition to management systems, which apply predominantly to networks in built-up areas, another class of interventions relates to the design of roadway networks for new districts. Such interventions explore the configurations of a network that will inherently reduce the probability of collisions.
Interventions for the prevention of road traffic injuries are often evaluated; the Cochrane Library has published a wide variety of reviews of interventions for the prevention of road-traffic injuries.
For the purposes of road-traffic safety it can be helpful to classify roads into three usages:
Most injuries occur on urban streets but most fatalities on rural roads, while motorways are the safest in relation to distance traveled. For example, in 2013, German autobahns carried 31% of motorized road traffic (in travel-kilometres) while accounting for 13% of Germany's traffic deaths. The autobahn fatality-rate of 1.9 deaths per billion-travel-kilometres compared favorably with the 4.7 rate on urban streets and 6.6 rate on rural roads.
Important people traversing crowded streets and alleys in ancient Rome (famous for its Roman roads) deployed minions to clear the way for their litters or (if allowed) carts and chariots.
Even the mighty preferred not to trample the bystanders.
In the 19th century the advent of powered vehicles inspired British road-safety law to impose speed limits and to require a person on foot carrying a red flag warning of the arrival of a frightening noisy mechanical contrivance.
Subsequently, motoring lobby-groups pressed for the priority of motorized traffic, and safety laws drove playing children off the streets and ghettoized the likes of walkers, bicycles, wheel-chairs and scooters to the margins.
Concepts like shared space, and Woonerf developed to counter this paradigm.
For planned neighbourhoods, studies recommend new network configurations, such as the Fused Grid or 3-Way Offset. These layout models organize a neighbourhood area as a zone of no cut-through traffic by means of loops or dead-end streets. They also ensure that pedestrians and bicycles have a distinct advantage by introducing exclusive shortcuts by path connections through blocks and parks. Such a principle of organization is referred to as "Filtered Permeability" implying a preferential treatment of active modes of transport. These new patterns, which are recommended for laying out neighbourhoods, are based on analyses of collision data of large regional districts and over extended periods.Sun, J. & Lovegrove, G. (2008). Research Study on Evaluating the Level of Safety of the Fused Grid Road Pattern, External Research Project for CMHC, Ottawa, OntarioEric Dumbaugh and Robert Rae. Safe Urban Form: Revisiting the Relationship Between Community Design and Traffic Safety. Journal of the American Planning Association, Vol. 75, No. 3, Summer 2009Vicky Feng Wei, BASc and Gord Lovegrove PhD (2011), Sustainable Road Safety: A New Neighbourhood Road Pattern that saves VRU Lives, University of British Columbia They show that four-way intersections combined with cut-through traffic are the most significant contributors to increased collisions.
Modern safety barriers are designed to absorb impact energy and minimize the risk to the occupants of cars and bystanders. For example, most side rails are now anchored to the ground, so that they cannot skewer a passenger compartment. Most light poles are designed to break at the base rather than violently stop a car that hits them. Some road fixtures such as signs and fire hydrants are designed to collapse on impact. authorities have removed trees in the vicinity of roads; while the idea of "dangerous trees" has attracted a certain amount of skepticism, unforgiving objects such as trees can cause severe damage and injury to errant road users. Safety barriers can provide some combination of physical protection and visual protection depending on their environment. Physical protection is important for protecting sensitive building and pedestrian areas. Visual protection is necessary to alert drivers to changes in road patterns.
Most roads are cambered (crowned), that is, made so that they have rounded surfaces, to reduce standing water and ice, primarily to prevent frost damage but also increasing traction in poor weather. Some sections of road are now surfaced with porous bitumen to enhance drainage; this is particularly done on bends. These are just a few elements of highway engineering. As well as that, there are often grooves cut into the surface of cement highways to channel water away, and rumble strips at the edges of highways to rouse inattentive drivers with the loud noise they make when driven over. In some cases, there are raised markers between lanes to reinforce the lane boundaries; these are often reflective. In pedestrian areas, are often placed to slow cars, preventing them from going too fast near pedestrians.
Poor road surfaces can lead to safety problems. If too much asphalt or bituminous binder is used in asphalt concrete, the binder can 'bleed' or flush' to the surface, leaving a very smooth surface that provides little traction when wet. Certain kinds of stone aggregate become very smooth or polished under the constant wearing action of vehicle tyres, again leading to poor wet-weather traction. Either of these problems can increase wet-weather crashes by increasing braking distances or contributing to loss of control. If the pavement is insufficiently sloped or poorly drained, standing water on the surface can also lead to wet-weather crashes due to hydroplaning.
Lane markers in some countries and states are marked with cat's eyes, Botts' dots or reflective raised pavement markers that do not fade like paint. Botts dots are not used where it is icy in the winter, because frost and snowplows can break the glue that holds them to the road, although they can be embedded in short, shallow trenches carved in the roadway, as is done in the mountainous regions of California.
Road hazards and intersections in some areas are now usually marked several times, roughly five, twenty, and sixty seconds in advance so that drivers are less likely to attempt violent manoeuvres.
Most road signs and pavement marking materials are retro-reflector, incorporating small glass spheres or prisms to more efficiently reflect light from vehicle headlights back to the driver's eyes.
Countermeasures for this type of collision include:
In the absence of these facilities as a driver about to turn:
There is no presumption of negligence which arises from the bare fact of a collision at an intersection, See Official Reports Opinions Online and circumstances may dictate that a left turn is safer than to turn right. The American Association of State Highway Transportation Officials (AASHTO) recommends in their publication Geometric Design of Highways and Streets that left or right turns are to be provided the same time gap. Some states have recognized this in statute, and a presumption of negligence is only raised because of the turn if and only if the turn was prohibited by an erected sign. See opinions on C.V.C. § 22101: Official Reports Opinions Online
Turns across traffic have been shown to be problematic for older drivers.
American passive traffic safety measures which were adopted in the mid-20th century created roadways which were forgiving to motorists traveling at high speeds but which de-prioritized cycling and pedestrian facilities. Passive traffic safety policies led to excessively wide streets, clear zones adjacent to roadways, wide turn radii and a focus on protecting drivers from the consequences of high speeds. Passive traffic safety measures sought to avoid influencing the behavior of drivers while giving automobiles maximum convenience. Recent Complete streets policies seek to create design-oriented traffic safety improvements which actively slow drivers down by narrowing roadways while better accommodating pedestrians and cyclists.
Pedestrians' advocates question the equitability of schemes if they impose extra time and effort on the pedestrian to remain safe from vehicles, for example overbridges with long slopes or steps up and down, underpasses with steps and addition possible risk of crime and at-grade crossings off the desired crossing line. Make Roads Safe was criticised in 2007 for proposing such features. Successful pedestrian schemes tend to avoid over-bridges and underpasses and instead use at-grade crossings (such as pedestrian crossings) close to the intended route. Successful cycling schemes by contrast avoid frequent stops even if some additional distance is involved, because cyclists expend more energy when starting off.
In Costa Rica 57% of road deaths are pedestrians. However, a partnership between AACR, Cosevi, MOPT and iRAP has proposed the construction of 190 km of pedestrian footpaths and 170 pedestrian crossings which could save over 9000 fatal or serious injuries over 20 years.
During the 1990s a new approach, known as 'shared space' was developed which removed many of these features in some places has attracted the attention of authorities around the world. The approach was developed by Hans Monderman who believed that "if you treat drivers like idiots, they act as idiots" and proposed that trusting drivers to behave was more successful than forcing them to behave. Professor John Adams, an expert on risk compensation, suggested that traditional traffic engineering measures assumed that motorists were "selfish, stupid, obedient automatons who had to be protected from their own stupidity" and non-motorists were treated as "vulnerable, stupid, obedient automatons who had to be protected from cars – and their own stupidity".
Reported results indicate that the 'shared space' approach leads to significantly reduced traffic speeds, the virtual elimination of road casualties, and a reduction in congestion. share some similarities with shared spaces. The Woonerf also sought to reduce traffic speeds in community and housing zones by the use of lower speed limits enforced by the use of special signage and road markings, the introduction of traffic calming measures, and by giving pedestrians priority over motorists.
Fatalities on the rural roads come from the many collisions due to the dangers that exist on such roads, and the important energy involved in those collisions due to the practiced speeds. In contrast, risks of collision are less numerous on motorways, and speeds are lower on rural roads.
Safety features include:
The ends of some guard in rails on high-speed highways in the United States are protected with impact attenuators, designed to gradually absorb the kinetic energy of a vehicle and slow it more gently before it can strike the end of the guard rail head on, which would be devastating at high speed. Several mechanisms are used to dissipate kinetic energy. , a system of sand-filled barrels, uses momentum transfer from the vehicle to the sand. Many other systems are tear or deform steel members to absorb energy and gradually stop the vehicle.
In some countries major roads have "tone bands" impressed or cut into the edges of the legal roadway, so that drowsing drivers are awakened by a loud hum as they release the steering and drift off the edge of the road. Tone bands are also referred to as "rumble strips", owing to the sound they create. An alternative method is the use of "Raised Rib" markings, which consists of a continuous line marking with ribs across the line at regular intervals. They were first specially authorised for use on motorways as an edge line marking to separate the edge of the hard shoulder from the main carriageway. The objective of the marking is to achieve improved visual delineation of the carriageway edge in wet conditions at night. It also provides an audible/vibratory warning to vehicle drivers, should they stray from the carriageway, and run onto the marking.
Better motorways are banked on curves to reduce the need for tire-traction and increase stability for vehicles with high centers of gravity.
The US has developed a prototype automated roadway, to reduce driver fatigue and increase the carrying capacity of the roadway. Roadside units participating in future wireless vehicle safety communications networks have been studied.
Motorways are far more expensive and space-consumptive to build than ordinary roads, so are only used as principal arterial routes. In developed nations, motorways bear a significant portion of motorized travel; for example, the United Kingdom's 3533 km of motorways represented less than 1.5% of the United Kingdom's roadways in 2003, but carry 23% of road traffic.
The proportion of traffic borne by motorways is a significant safety factor. For example, even though the United Kingdom had a higher fatality rates on both motorways and non-motorways than Finland, both nations shared the same overall fatality rate in 2003. This result was due to the United Kingdom's higher proportion of motorway travel.
Similarly, the reduction of conflicts with other vehicles on motorways results in smoother traffic flow, reduced collision rates, and reduced fuel consumption compared with stop-and-go traffic on other roadways.
The improved safety and fuel economy of motorways are common justifications for building more motorways. However, the planned capacity of motorways is often exceeded in a shorter timeframe than initially planned, due to the under estimation of the extent of the suppressed demand for road travel. In developing nations, there is significant public debate on the desirability of continued investment in motorways.
With effect from January 2005 and based primarily on safety grounds, the UK's Highways Agency's policy is that all new motorway schemes are to use high containment concrete step barriers in the central reserve. All existing motorways will introduce concrete barriers into the central reserve as part of ongoing upgrades and through replacement as and when these systems have reached the end of their useful life. This change of policy applies only to barriers in the central reserve of high speed roads and not to verge side barriers. Other routes will continue to use steel barriers.
More people die on the hard shoulder than on the highway itself. Without other vehicles passing a parked car, following drivers are unaware that the vehicle is parked, despite hazard lights. Truck drivers indicate that they are parked by putting their cab seat behind their truck. In the UK, the AA and police park their vehicles on the hard shoulder at a slight angle so that following drivers can see down the side of their vehicle and are therefore aware that they are stopped.
30% of highway crashes occur in the vicinity of toll collection booths in the countries that have them, these can be reduced by switching to electronic toll systems.
The main ways to stay safe when travelling by bus or coach are as follows:
Motorists and passengers – both front and rear – can make dooring less likely by practicing the "Dutch reach" – opening the car door by reaching across the body with the more distant hand.
Together for Safer Roads (TSR) has developed best practices for implementing corporate road safety programs that includes data management and analysis, route mapping, investment and upkeep of fleets, safety policies and training for employees, and first-aid/safety training in case collisions do occur.
Some jurisdictions, such as the US states Virginia and Maryland, have implemented specific regulations such as the prohibiting mobile phone use by, and limiting the number of passengers accompanying, young and inexperienced drivers. The State of Safety Report from the National Safety Council released in 2017 ranks states on these road safety regulations. It has been noticed that more serious collisions occur at night, when vehicles are more likely to have multiple occupants, and when seat belts are less likely to be used.
The Insurance Institute for Highway Safety proposes restrictions for new drivers, including a "curfew" imposed on young drivers to prevent them driving at night, an experienced supervisor to chaperone the less experienced driver, forbidding the carrying of passengers, zero alcohol tolerance, raising the standards required for driving instructors and improving the driving test, vehicle restrictions (e.g. restricting access to 'high-performance' vehicles), a sign placed on the back of the vehicle (an N- or L-Plate) to notify other drivers of a novice driver and encouraging good behaviour in the post-test period.
While government has primary responsibility for providing safe roads, the challenges of development and equity require that all segments of society engage and contribute, including the private sector. Private and public sector coalitions, like Together for Safer Roads (TSR) and the Road to Zero Coalition exist to work alongside government policies to advance the business case of having safer roads; they help companies meet their duty of care to employees and minimize fleet-related dangers to the wider community. Safer roads also benefit business by improving employee health and safety, by protecting assets, reducing productivity losses and healthcare costs, and enhancing the efficiency and effectiveness of supply chains.
Some countries or states have already implemented some of these ideas through Vision Zero networks. PAYD adjusts insurance costs according to when and where the person drives.
There are plans to extend the measurements to rate the probability of a collision for the road. These ratings are being used to inform planning and authorities' targets. For example, in Britain two-thirds of all road deaths happen on rural roads, which score badly when compared to the high quality motorway network; single carriageways claim 80% of rural deaths and serious injuries, while 40% of rural car occupant casualties are in cars that hit roadside objects, such as trees. Improvements in driver training and safety features for rural roads are hoped to reduce this statistic.
The number of designated traffic officers in the UK fell from 15% to 20% of police force strength
in 1966 to seven per cent of force strength in 1998, and between 1999 and 2004 by 21%. It is an item of debate whether the reduction in traffic collisions per 100 million miles driven over this time has been due to robotic enforcement.
In the United States, roads are not government-rated, for media-releases and public knowledge on their actual safety features. unclear However, in 2011, the National Highway Traffic Safety Administration's Traffic Safety Facts found that over 800 persons were killed across the US by "non-fixed objects" that includes roadway debris. California had the highest number of total deaths from those crashes; New Mexico had a best chance for an individual to die from experiencing any vehicle-debris crash.
It is estimated that motor vehicle collisions caused the death of around 60 million people during the 20th century, around the same number of World War II casualties.
As the comparatively poor improvements in pedestrian safety have become a concern at OECD level, the Joint Transport Research Centre of OECD and the International Transport Forum (JTRC) convened an international expert group and published a report entitled ”Pedestrian Safety, Urban Space and Health in 2012”.
According to BITRE/Australia agency changes in growth in population, vehicle registration, and estimated vehicle kilometres travelled have various impact on death trend from OECD countries.
According to the BITRE, traveled distance has a limited impact on death trend from OECD countries.
National Association of City Transportation Officials
International Municipal Signal Association: A traffic standard organization.
The Pedestrians Association (now known as Living Streets) in the United Kingdom was formed in 1929 to press for better road safety. Other groups have been active in other countries.
The International Road Federation has an issue area and working group dedicated to road safety. They work with their membership to advocate measures that improve road safety through infrastructure and cooperation with other international organizations. IRF Road Safety .
Motoring advocacy groups including the Association of British Drivers (UK), Speed cameras.org (UK), National Motorists Association (US/Canada) argue that the strict enforcement of speed limits does not necessarily result in safer driving, and may even have negative effect on road safety in general. SafeSpeed was a UK group set up specifically to campaign against the use of speed cameras.
Together for Safer Roads (TSR) is a coalition that brings together global private sector companies, across industries, to collaborate on improving road safety. TSR brings together members' knowledge, data, technology, and global networks to focus on five road safety areas with the goal of bringing about the greatest impact globally and within local communities.
In 1965, Ralph Nader put pressure on car manufacturers in his book Unsafe at Any Speed, detailing resistance by car manufacturers to the introduction of safety features such as seat belts, and their general reluctance to spend money on improving safety. The GM President James Roche was later forced to appear before a United States Senate subcommittee, and to apologize to Nader for the company's campaign of harassment and intimidation. Nader later successfully sued GM for excessive invasion of privacy.
RoadPeace was formed in 1991 in the United Kingdom to advocate for better road safety and founded World Day of Remembrance for Road Traffic Victims in 1993 which received support from the United Nations General Assembly in 2005.
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Autobahn 18,452 428 82 1.9 23.2 Rural 73,003 1,934 249 6.6 26.5 Urban 199,650 977 958 4.7 4.9 Total, Average 291,105 3,399 401 4.6 11.6
History
Mortality
Mortality units
Mortality statistics
+ Fatalities by billion traveled km Fatalities by VMT allow to compare different class of roads, here in France Source:
Built-up areas
Turning across traffic
Designing for pedestrians and cyclists
Shared space
Non-built-up areas
Major highways
Vehicle safety
Buses and coaches
Cars
Motorbikes
Trucks
Police
Regulation of road users
Motor vehicle users
Pedal bicycle users
Pedestrians
Animals
Information campaigns
Statistics
Rating roads for safety
KSI statistics
KSI 2013
123 n.a. 23 529 52%,45% / 19%,45% 30–60 / 110 / 130 51 50 7 751 97% / 96% 50, 60–80 / 100 or 110 / 110 54 58 8 710 89% / 77% 50 / 100 / 130 65 71 10 627 86% / 63%,79%2012 30–50 / 70–90 / 120 1432014 n.a. 78 151 17% / n.a. 40 / 90 / n.a. 55 56 9 644 95% / 95% (estimated) (Metropolitan) 40–70 / 80–90 / 100–110 120 n.a. 50 237 62,78% / 15% 50 / 100–120 / 120 62 157 11 560 97% / 66% 50 / 90 / 130 34 39 6 523 94% / 81% 50 / 80 / 130 (110) 48 48 7 725 95% / 87% 50 / 80 (winter) 100 (summer) / 120 (100) 51 58 8 647 98% / 84%,90%2010 50 / 90 / 130 (110 bad w.) 41 46 6 651 96–98% / 97,98% 50 / 100 / no limit or 130 79 n.a. 11 726 77%,74% / 23%2009 50 / 90 (110) / 130 (110) 60 n.a. 16 366 87% / 57%,90% 50 / 90 / 130 (110) 47 47 6 830 84% / 65% 50 / 90 (80) / n.a. 41 40 8 541 92% / 88%,91% 50 / 80 or 100 / 120 34 54 9 352 97% / 74% 50,70 / 80,90,100 / 110 57 n.a. 7 821 64%–76% / 10%2011 50 / 90–110 / 130 (110 bad w., 100 novice, 150) 122 n.a. 87 130 44% / very low (estimated)2008 50 / 50 / 70 or 110 40 69 6 657 96%,94% / 61% 40,50,60 / 50,60 / 100 87 n.a. 11 766 95% / 33% 50 / 90 (70) / 120 or 130 (110 in winter) 84 n.a. 11 771 80% / n.a.2003 50 / 90 / 130 (110 in rain) 231 122 29 792Including motorised two-wheelers 82%,68% / 9% 50 / 90 / 110 116 n.a. 117 100 49%,46% / n.a. 50 / 100 / 120 34 45 5 537 97% / 82% 50 / 80 / 130 57 63 8 734 97% / 92%,93% 50 / 100 / 100 37 43 5 707 95% / 87–88% 30,50 / 80 / 90,100,110 87 n.a. 14 636 90% / 71%,89% 50 (60) / 90–120 / 140 61 n.a. 11 551 96% / 77%,89–100% 50 / 90 / 120 124 201 35 353 n.a. 60 / 90 / 110 or 130 71 n.a. 20 347 84% / 19% 50 / 80 / 130 61 72 10 638 94% / 66%,87–94% 50 / 90 (110) / 130 101 172 23 450 89%,75% / 22% (on motorways) 60 / 60–80 / 110 (100) 36 n.a. 5 662 90% / 81% 50 / 90 or 100 / 120 27 34 5 597 97% / 81%,95% 30,40,50 / 60,70,80,90,100 / 110 or 120 33 43 5 708 94%,93% / 77%,93% 50 / 80 / 120 28 35 5 551 96% / 92% 48 / 96 or 113 / 113 103 68 12 852 87% / 74% set by state / set by state / 88–129 (set by state)
KSI 2020
0.1 0.2 - - - 0.2 0.0 0.2 0.0 0.0 - - 0.0 - 0.4
Time effect
SÉCURITÉ ROUTIÈRE:
Quelle est la situation dans votre pays?
ec.europa.eu/transport/road_safety/pdf/statistics/dacota/scoreboard_2015_en.pdf
D'après des données CARE/Eurostat
Traveled distance effect
Road traffic safety professional societies
Road traffic safety guide and reference manuals
Signalized Intersections Informational Guide
Advocacy groups
See also
Notes and references
Notes
Sources
External links
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