Running-In, Please Pass Bumper Sticker
When you first drive a car, whether it's new or just new to you, it's a good idea to drive slowly so that you can get used to the handling and controls of the vehicle. Each car, even the same make and model, handles slightly differently. Your handbook may include such advice as avoiding heavy acceleration and braking, keeping the revs at around 3000, etc. You can put this bumper sticker on the rear driver's side bumper of your car so that everyone behind you will know why you're driving more cautiously, and that it's ok to overtake you. It's courteous, it's friendly, and it's cheap. It was designed to be friendly and attractive, yet clear enough to read at a glance.