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The time given for green light of pedestrian crossings are based on average walking speed of ordinary people plus some addition for Disabled and slow walkers.
A seperate button to be pushed by disabled people and slow walkers, incorporated with the existing system, can be set on a longer time. On the other hand the normal pedestrian button can be set on a lower time for healthy people. This will help the flow of traffic and give disabled people more security and independence.
I am a disabled person and see that my fellow disabled friends also suffer from having to exert themselves dangerously when using the pedestrian crossings.