I’ve been a pedestrian/transit-rider since I got rid of my car in 1999. I still have my driver’s licence and occasionally drive (someone to the airport, eg.). Having spent that much time on the outside of the car I have a different attitude about speed than I did 10 years ago.
On the freeway it’s all about relative speeds (I will go 10 over if I can, but I also adhere to the 2-second following-distance); if someone is going a lot faster or slower than the cars around them, especially in heavy traffic, there’s bound to be trouble.
But wherever there are cross-walks, driveways, bike-lanes, cross-streets, schools, churches, shops, parks, bus-stops, mailboxes… I do not exceed the speed limit. Neighborhoods are sacred spaces.