What are some techniques to control car drivers inside cities in order to make thigns safer for cyclists and pedestrians?

Heres a few I know
>wide roads make drivers want to go faster: IE if you make a road have space for 150% of the width of a car they will go faster than if its just 110%
>tighter roads make drivers wanna go slower
>obstacles placed on a road to force cars to slow down and turn in a straight road help too
what else? i love all the measures that don't involve speed bumps.
I think its better to make the driver FEEL like he has to go slow, rather than making him feel like hes being forced or nagged to go slow