No silver bullet but a life-saver all the same

MORE than 400 people were killed on London's roads in 1990. Increasing volumes of traffic, unsafe roads and speeding prompted many to demand lower speeds in their streets and neighbourhoods.

- Jeremy Leach

Over two decades, more than 300 traffic-calmed 20mph zones were introduced in residential areas. In these new 20mph zones, the numbers of serious and fatal casualties fell by more than 40 per cent. But little changed on London's main roads and town centres. This is where vehicles and people mix and the majority of serious and fatal casualties happen.