Since it was brought up in the latest episode, I figured a chase thread would be a good idea. So, props, tricks, anything you've done right or wrong with your chase scenes.
I try to use them fairly often and nearly always hit the problem of players saying they don't understand the distances or the positions of the chase. My current plan, for the next modern day chase scene, is to get a hotwheels car and slowly roll it across the table, representing the time they have before they must make a choice. I'll keep my box of wooden objects and shapes nearby to toss out onto the table and give them a more clear picture of the general shape of things around him.
I might also use a second little car if they are being chased, to show just how far apart, and on which side of what, those involved in the chase are.