There's a company that will outfit your fleet vehicles (busses, limos, cabs, company cars) with multiple cameras. These cameras can capture both forward-looking view and driver view as well as forward and side g-forces. Their website provides a few 'case-studies'. These are actually just really funny crash videos. The guy falling asleep and crashing is both scary and funny. Same with the bus driver jumping parked cars.

DriveCam.Com

(Note, I had a problem on one PC getting the video's to play.. but it was okay on 3 others. You'll need to download their custom flash player too)

-nuts