To let a driver know they are either going too slow or doing something wrong. It is a good way to wake a driver up! :)
Automobiles horns serve as a waring device. A driver blows his horn to alert another driver and get his attention. This is why they are legally required for cars to have. They are also useful when you want to pick someone up at his house.
They can have horns
The possessive form of the plural noun automobiles is automobiles'.Example: The automobiles' manufacturers are offering rebates at this time.
Horns.
narwhals have horns
horns
yes they do have horns
Horns of a Dilemma
No snakes have horns.
They don't have horns
addaxs horns
horns