How to Signal on a Bike? | Hand Signals That Keep You Safe

For the full breakdown, see our best Turn Signals for Bicycles guide.

Learning how to signal on a bike is one of the fastest ways to make yourself predictable to drivers, and predictability is what keeps you alive in traffic. The standard hand signals used across the U.S. come from the National Highway Traffic Safety Administration (NHTSA), and they take about ten seconds to learn. This guide shows you each signal clearly, explains the one signal that varies by state, and covers when to signal so drivers actually see you.

The Three Core Hand Signals Every Rider Should Know

There are three situations where you must signal: turning left, turning right, and slowing or stopping. Each has a clear, distinct arm position that drivers and other cyclists recognize instantly.

• Left turn: Extend your left arm straight out to the side, parallel to the ground, with your hand open or in a fist.
• Right turn: Extend your right arm straight out to the side, or bend your left arm upward at the elbow with your hand pointing up. NHTSA training materials show the bent-left-arm version, which is the traditional and universally accepted signal.
• Stop or slow: Extend your left arm out to the side and bend it downward at the elbow, so your hand points down with your palm facing back. Some riders extend the right arm down instead, though the left-arm-down version is the one NHTSA teaches.

Hold each signal for a few seconds before you make the move. A quick flick of the arm helps no one; drivers need time to register what you’re doing and react.

Right Turn Signals: Why There Are Two Versions

The right-turn signal is the only one with a genuine controversy, and it comes down to state law. The straight right arm is a natural, obvious signal many riders prefer. The problem is that some states only recognize the bent-left-arm version, since that was the standard when most traffic codes were written.

NHTSA’s handout is a general safety guide and does not itself establish state law. State and local rules can differ on whether the straight-right-arm signal is accepted, and some states don’t allow it at all. Before you rely on the straight right arm, check your local traffic code. When in doubt, the bent-left-arm signal works everywhere and is what most driver’s-ed materials teach, so it’s the safer default.

Whichever version you use, be consistent. Drivers who see the same signal repeated will anticipate your move more reliably.

When To Signal and How To Stay Safe While Doing It

Signaling is only useful when drivers can see it, which means timing and technique matter as much as the arm position itself. The common guideline is to signal about 100 feet before you turn or stop — roughly half a city block. This is not an official federal rule, but it gives drivers in most traffic conditions enough time to notice you and adjust.

Keep your signals visible and avoid compromising bike control. Removing one hand from the handlebar makes steering less stable, especially at speed or on rough pavement. If you’re braking hard, descending a steep hill, or navigating a tricky surface, it’s acceptable to skip the signal rather than risk a crash. You can also signal with just two fingers on the bar to maintain some steering control.

Make eye contact with drivers when you can, and check over your shoulder before you actually turn. A signal tells drivers your intention; a shoulder check confirms the lane is clear. Both together make the maneuver safe. Once you’re comfortable with these basics, a set of electronic turn signals for bicycles can make your intentions even more visible in low-light conditions — our tested roundup covers the best options on the market.

NHTSA’s bicycle safety materials, including the official hand-signal handout, present this same core set of signals. They emphasize that signaling is an expectation for all cyclists, not an optional courtesy. The NHTSA hand-signal handout is worth bookmarking if you want the official visual reference.