If people can’t follow the speed limit they should be fined.

What’s the point in speed limits if they aren’t enforced?

I’ve never had a problem driving 20. In fact I do it voluntarily in some build up neighbourhoods.

Plus 20 mph is basically sprinting.

Edit:

Yes, 15mph is very fast for a runner as it equates to a 4-minute mile. 15mph represents the fastest a human can run, with extensive training,