Speed bumps may be the bane of car drivers’ lives, but it seems they are also effective. Britain’s death rate from transport accidents (over 95% of which are on the roads) is now the lowest in the world. Traffic fatalities fell by half in 2000-13, even though the number of miles driven rose. The key to making roads safer is reducing speed, according to the World Health Organisation. Pedestrians have a 90% survival rate when hit by a vehicle at 20mph (32kph); over 50mph they stand almost no chance. Britain has been quicker than most countries in cutting speed limits in cities to 20mph. It is now focusing on making roads safer for cyclists, bikers and pedestrians, who make up half of all road deaths.