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Speed humps and 20 mph limits bad for the environment

Traffic calming measures bad for the environmentA report from The AA has found that indiscriminate use of 20 mph speed limits and speed humps by local authorities can increase carbon dioxide emissions and fuel consumption.

Tests revealed that a car that achieves 58.15 miles per gallon at a steady 30 mph in fourth gear will only deliver 52.3 mpg at 20 mph in third gear and traveling over speed humps has an even greater impact with 6 speed humps over half a mile causing fuel consumption to increase by 47 percent to 30.85 mpg.

Whilst traffic calming measures are necessary in some areas the report shows that badly placed 20 mph restrictions or speed humps can increase CO2 emissions unnecessarily.

Edmund King, the AA’s president said “We need independent research to ascertain both the safety and environmental implications of 20 mph zones so that authorities don’t make a huge and widespread environmental mistake. Researched guidance on 30 mph versus 20 mph limits versus speed humps will help road engineers to make informed decisions on where best to site lower speed restrictions on urban roads.”

AA: Fuel For Thought


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