You have probably seen a variety of “traffic calming measures” when you drive down roads. These range from speed bumps to pavement markings to deliberate narrowing of the roads.
Here is an article reporting results from pavement markings designed to produce an optical illusion that makes it appear that you are driving faster than you actually are. The markings are being used at the approach to a corner with a bad accident record, and they seem to we working quite well.