Signals, Horns, and Headlights

Your signals, horn, and headlights are important for communicating with other drivers, pedestrians, and bicyclists.

Signaling

Always signal when you turn, change lanes, slow down, or stop.

You can signal using your vehicle’s signal lights or using hand-and-arm positions. If your signal lights are not functioning, or bright sunlight makes your signal lights hard to see, use the hand-and-arm signals shown in the image below.

Bicyclists may signal a turn with their arm held straight out, pointing in the direction they plan to turn.

You should signal:

• At least 100 feet before you turn.
• Before every lane change.
• At least five seconds before you change lanes on a freeway.
• Before pulling next to the curb or away from the curb.
• Even when you do not see other vehicles around you.
• When you are almost through the intersection if you plan to turn shortly after crossing the intersection.

Remember to turn off your signal when you no longer need it.

Using Your Horn

Use your vehicle’s horn to let other drivers know you are there or warn others of a hazard. Use your horn to:

• Avoid collisions.
• Alert oncoming traffic on narrow mountain roads where you cannot see at least 200 feet ahead.

Using Your Headlights

Your vehicle’s headlights help you see what is in front of you. They also make it easier for other drivers to see your vehicle. Dim your high-beam headlights to low beams within 500 feet of a vehicle coming toward you or within 300 feet of a vehicle you are following. It is illegal to drive using only parking lights. Use your headlights:

• When it is too dark to see from 1,000 feet away.
• Beginning 30 minutes after sunset.
• Until 30 minutes before sunrise.
• In adverse weather. If you need to use your windshield wipers due to fog, rain, or snow, you must turn on your low-beam headlights.
• When conditions (such as clouds, dust, smoke, or fog) prevent you from seeing other vehicles.
• On mountain roads and tunnels (even on sunny days).
• When a road sign states that headlights must be on.
• To help other drivers see your vehicle, especially when the sun is low on the horizon.

Using Your Emergency Flashers

If you can see a collision or hazard ahead, warn drivers behind you using these methods:

• Turn on your emergency flashers.
• Lightly tap your brake pedal three or four times.
• Use a hand signal when slowing and stopping.

If you need to stop because of vehicle trouble:

• Turn on your emergency flashers. If your vehicle does not have emergency flashers, use your turn signals.
• If possible, pull off the road away from all traffic.
• If you cannot get completely off the road, stop where people can see you and your vehicle from behind.
• Do not stop just over a hill or just around a curve. Other drivers may not see your vehicle in time to avoid a collision.
• Call for emergency roadside assistance and stay in your vehicle until help arrives.