On the weekend I went out of town with some friends, and was a passenger in my friend's car that I haven't been in before. About half an hour into the trip, my pump gave an Occlusion Error (something I've never had before). I panicked a lot, then changed position in the seat and this fixed it. The conclusion was that the seat belt was pressing against the tubing and upset the pump. Unfortunately for me, I panicked so much that I made my blood sugar go up from the stress of it all. To ensure the same thing doesn't happen to you, either tuck away your pump and tubing (eg in your pocket) or else put the tubing between the two parts of the seatbelt (if you are using the pump frequently).