Do you frequently travel or commute on the highway, but the traffic slows down to 5 mph while the HOV lane traffic still zooms by at 80? You must have a problem and wanna sneak into there. You can do so now with a few cheap things.
Step 1: What should you do? Mannequin?
The first thought that comes to mind would probably be "put a realistic mannequin in the passenger seat." That would fool cops, but it would be pretty darn expensive to buy one... So let's look at some cheaper alternatives.