[nashashmi]

Two reasons why:

A car has better ability to brake suddenly then scooters and bikes where the rider can get thrown forward. I can hear a car coming. In the city they don't drive fast where as bikes ignore lots of rules and travel very quickly.

Ask yourself this: is a motorbike hitting a pedestrian more dangerous or a car hitting a pedestrian, where are both are driving at city speeds with lots of braking in short distances.