What do you hate to see on your car?

a person would hate a truck since at the back of the truck, there will sometimes come out some black smelley gasses. It will make the driver harder to see and may smalls weird in the car. Eventhough a big truck is for working, don't go behind the truck for a long time and be too close. Get infront of the truck so you may not smell bad and may not be slow.