The Transport Agency is supporting plans by some councils to change their carparking rules so that motorists have to reverse into angled carparks.
It says doing so would help reduce accidents, especially between cars and bikes.
The agency's spokesperson, Andy Knackstedt, says at the moment drivers reverse out of the parks, so they should be able to reverse in.
But the Automobile Association says motorists with poor mobility, especially elderly drivers, find it difficult to reverse into parks.
The Transport Agency says councils should be free to choose whether they change their parking policy, but if they do, they should use signage which is consistent with other areas.