I believe it's an issue of liability. When you take a plane, train, bus, boat, cab, or limo, and if you're in an accident, you have recourse. If you have an accident in a rental car, assuming the accident was not caused by a mechanical malfunction, your only recourse is your insurance or the other drivers insurance. If the company allowed you to use a rental, I'd think that they would share the responsibility and therefore, accountability, for that accident. The reason we can use rentals during ITU is because we're on the clock 24/7 then. At least that's my story and I'm sticking to it.

JJ