Slowing down to 20mph

Aberdeen has set a 20mph speed limit on 100 city centre streets.

The city council says it will boost pedestrian safety, some business leaders say it will damage trade.

More on BBC News Online.

Safe Speed says ...

• If someone is hit by a car at 40 mph they are 90% likely to be killed.
• If someone is hit by a car at 30 mph they are 50% likely to be killed.
• If someone is hit by a car at 20 mph they are 10% likely to be killed.