According to the driver's manual, why should you limit the use of your horn?

Question

Accepted Answer

C: It can startle other drivers.. Use your horn to alert others of your presence, which can help you avoid a crash. Use your horn when necessary, but remember it's loud enough to startle others and put them at risk.

According to the driver's manual, why should you limit the use of your horn?

South Dakota CDL General Knowledge Test Info