I'm going to be directing It's a Wonderful Life: A Live Radio Play and I think we're getting close to our sound effects, but we still need the sound of a car.  Ideally we would want it to arrive and leave, but also driving down the road.  I've scoured the internet and about the only thing I've found is a pro that used a sewing machine motor, but I don't think we're going to get that lucky. 

Any suggestions?

Thanks