How 20mph on our roads benefits everyone Letters

The Guardian - The advantages of 20mph speed limits are celebrated by Rod King, while John Hopkin says drivers who speed wonmp;#146;t be deterred unless tougher action is taken against themThanks to Christian Wolmar for his insightful article on a 20mph limit and how it would be a good thing for Birmingham (Dear culture-war motorists, look to the future. Wemp;#146;ll all be driving at 20mph soon, 28 August). He is right to identify that the world has changed from when the car was king and we pla