The Institute of Welsh Affairs in its recent report on “Decarbonising Transport in Wales” has called for a default 20mph urban limit as a key recommendation to enable Wales to meet its projected energy demands entirely by 2035.
Many people think that driving at 20mph lowers fuel economy. Yet research shows that for many cars a steady 20mph is the most efficient speed if you can keep it steady. Indeed at 20mph many cars will achieve fuel consumption better than 90mpg. But what changes things is in an urban environment where you are consistently slowing down for obstacles, lights, junction and congestion and then having to speed up again.
Here we explore the engineering principle behind the energy that gets used by a motor vehicle when moving.Read more
Here we "bust" all the 20mph myths that opponents so often use as an argument against implementing an appropriate limit for residential, urban and village streetsRead more
It’s a popular misconception that fuel efficiency peaks at 50-60mph. Yet What Car magazine found that for many cars 20mph was the most efficient speed . In urban conditions 20mph beats 30mph for saving fuel. 20mph limits mean less acceleration and braking. Walking and cycling increase. 20’s Plenty is greenRead more
Many people assume that at lower speeds extra fuel is used and more pollution created. In fact the reverse is true. That’s why "Total 20", without traffic calming, is supported by so many environmental organisations.Read more