Feet

If the front of your foot ever gets run over, you'll most likely be fine. The weight of a car is first distributed amongst its four wheels. Next you'll need to measure the area of your foot that you want to have run over. Then you still need to consider other factors such as how full the tire is and how much of the tire will still be in contact with the ground.

With a bit of magic you'll be able to calculate the psi (pounds per square inch) or bar that will affect you foot. Summarized: unless you're unlucky, a car moving at a slow speed won't injure your foot.

Although somewhat unlikely to happen, having the back of your foot run over is probably way more dangerous due to the obvious weak point. Having your Achilles tendon injured could leave you bedridden for an extended period of time and may even leave you disabled.

(This could easily occur whilst exiting a vehicle if the driver isn't paying attention)

On a side note, good luck.