I don't drive but I have been criticised (if that's the right word for screams of terror) on decents while captaining the tandem!I'm sorry to admit that I can be a critical passenger when Mrs NR is driving. She gets all the pent-up lectures of a cyclist-commuter. I cannot abide people who fail to indicate, for example. My comments on our current speed cf the prevailing speed limit and conditions are usually fobbed off with "parallax error".