Speed kills in cities, and in Great Britain many cities are considering lowering speed limits within their jurisdictions to save lives and reduce injuries under the banner “20 (miles per hour) is plenty”. Portland Oregon as part of its commitment to eliminate all road deaths by 2025 has adopted the Vision Zero approach, accepting no road deaths as acceptable on their street networks.
Last year the city of Portland Oregon lowered the speed limits on their municipal road system from a default speed of 25 miles per hour to 20 miles per hour, or 32 kilometers per hour. In one year, the results are starting to come in, with a death toll on the roads of 34 people in 2018, a reduction from the 45 lives lost in 2017 before the reduced speeds.
There is sea change in the United States regarding road safety. A University of Chicago poll of 2,000 U.S. residents showed that 60 percent were “were supportive of using speed and red-light cameras as an automated enforcement tool. Sixty-nine percent of those polled said they would support lowering a speed limit by 5 miles per hour if it was justified with crash data.”
Lowering road speeds in cities has a remarkable impact on crash survival rates for vulnerable road users~a pedestrian has a 20 percent survival rate being crashed into at 30 miles per hour. That increases to 70 percent at 25 miles per hour and to 90 percent at 20 miles per hour. In the United States municipal speed limits are set by each state or territory, with the default speed being 25 miles per hour or 40 kilometers per hour.
The cities of Portland and Eugene have been looking at the safety system and Vision Zero approach embraced by European countries like the Netherlands and Sweden in making their cities safer. A “context-sensitive approach that emphasizes safety for vulnerable road users will lead to safer outcomes on streets in urban areas” Read more »