What Does One, Two, or Three Car Horn Beeps Mean?

[OKennedy]

Car horn beeps have the following meanings: One beep: A single beep (a short 'toot') is often used to greet oncoming traffic or, when turning, to alert vehicles on the other side to drive carefully. Two beeps: This is most commonly used when the car ahead needs to change lanes or to remind the following car not to tailgate. If the leading car beeps twice (or uses short 'toot-toot' sounds at night instead of flashing headlights), it may indicate the following car intends to overtake. Three beeps: This mainly occurs on slopes—signaling downhill traffic to yield to uphill vehicles. It can also indicate an emergency situation where the driver needs to overtake on poor road conditions, requesting the vehicle ahead to make way.