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What communities can do
Overview, see right hand column for more
Why it matters
Some quick points:
Major cause of deaths and injuries (directly)
As an example traffic "accidents" kill more than 40,000 each year in the United States alone.
In the western world the number of deaths have been declining in recent years, but in the developing world / "the south", traffic accidents take a larger and a growing toll, as the affluent increasingly use cars, but little is done to ensure acess and safety for those travelling by more sustainable means.
Major cost to society
Major cause of deaths and bad health (indirectly)
It has been claimed that a large part of the 400,000 estimated to die from a sedentary lifestyle and bad diet in the U.S. yearly could have lived longer if they had used their legs and hearts to go to work/school etc instead of using private cars. The World health organisation recommends 30 minutes of moderate exercise daily.
The fear of being killed in traffic accidents, and partly the measures being put in place to keep pedestrians and cyclists "safe" - that is keep them off the roads, deters people from walking or biking, but using private cars instead. (It needs to be mentioned that in well-functioning cities public transport and walking/cycling can be combined).
Safety concerns discourage sustainable transport
When sustainable transport is discouraged, population health is harmed through inactivity, but a modal shift to cycling, walking and the use of public transport would also reduce NOx, SOx, dust, noise, CO2, N2O, ground-level ozone and smog.
What improves safety? - Any tradeoffs ?
The measured improvement in traffic safety in the rich countries, is in part explained by better emergency treatment. Victims that would not have surivived 20 years ago now do. But this costs society a great deal, and seriously injured and molested people are many times as many as the ones killed, and very many of them require special and expensive care for the rest of their lives.
Part of the improvement can be linked to safer cars (safer for the occupants), and safer roads (primarily for motorists).
Part of the improvement might be explained by fewer sustainable and "soft" actors being out there in the traffic. The costs of this shift in terms of obesity/a sedentary lifestyle appears to offset what has been gained from technological advances.
Part of the improvement stems from the realisation that speed kills, and the subsequent creation of reduced speed-zones.
Pedestrian zones (also known as auto-free zones and car-free zones, and as pedestrian precincts in British English) are areas of a city or town reserved for pedestrian-only use and in which some or all automobile traffic may be prohibited. They are instituted by communities who feel that it is desirable to have pedestrian-only areas. Converting a street or an area to pedestrian-only use is called pedestrianisation.
Pedestrian zones have a great variety of attitudes or rules towards human-powered vehicles such as bicycles, inline skates, skateboards and kick scooters. Some have a total ban on anything with wheels, others ban certain categories, others segregate the human-powered wheels from foot traffic, and others still have no rules at all. Many of Middle Eastern casbas have no wheeled traffic, but use donkey-driven or hand-driven carts for freight transport. W
Streets designed primarily with the interests of pedestrians and cyclists in mind and as a social space where people can meet and where children may also be able to play legally and safely. These roads are still available for use by motor vehicles, however their design aims to reduce both the speed and dominance of motorised transport. This is often achieved using the shared space approach, with greatly reduced demarcations between vehicle traffic and pedestrians. Vehicle parking may also be restricted to designated bays. It became popular during the 1970´s in the Netherlands, which is why the Dutch word for a livingstreet (woonerf) is often used as a synonym.
Country-specific living street implementations include: complete streets (United States and Canada), home zone (United Kingdom), residential zone (ru:Жилая зона, Russia) shared zone (Australia / New Zealand), woonerf (Netherlands and Flanders) and zone résidentielle (France). W
An urban design approach which seeks to minimise demarcations between vehicle traffic and pedestrians, often by removing features such as curbs, road surface markings, traffic signs, and regulations. Typically used on narrower streets within the urban core and as part of living streets within residential areas, the approach has also been applied to busier roads, including Exhibition Road in Kensington, London. W
A transportation policy and design approach (United States and Canada), 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, bicycling, driving automobiles, riding public transportation, or delivering goods. W
News and comment
WHO adds its voice to evidence that 20mph limits are required for authorities to meet “duty of care” responsibilities, May 8 
2011-2020 Time for Action - Decade of Action for Road Safety
Officially proclaimed by the United Nations General Assembly in March 2010. Its goal is to stabilize and reduce the forecast level of road traffic deaths around the world. It is estimated that 5 millions lives could be saved on the world's roads during the Decade. W
Citizens data initiative
According to the Global status report on road safety, road traffic crashes take the lives of nearly 1.3 million people every year, and injure 20–50 million more. More than 90% of road traffic deaths and injuries occur in low-income and middle-income countries, which have only 48% of the world’s registered vehicles.