What a Signal Really Tells You

A turn signal is a way for drivers to share their intentions. That makes it useful. It does not make it a promise, and it does not give anyone the right to go.

Treat another driver’s signal as one piece of information alongside everything else you can see: their speed, their position in the lane, and what the traffic around them is doing. A signal can raise your attention. It shouldn’t be what makes your decision.

Why a Signal Can Mislead You

A driver whose signal is on may have:

• Turned it on by accident
• Forgotten to cancel it after an earlier turn or lane change
• Planned to turn farther ahead than you expect
• Changed their mind
• Meant to turn somewhere different from where you assumed

None of these drivers is trying to trick you. They’re just ordinary people, which is exactly why you can’t rely on the blinker alone.

Watch Movement, Not the Blinker

When you see a signal, shift your attention to what the vehicle is physically doing. Useful clues include:

• Speed: is it slowing down, or holding its pace?
• Brake lights: are they coming on as it approaches the turn?
• Lane position: is it moving toward the side it would turn to?
• Distance to the turn: is it close enough to the corner or driveway that turning makes sense?
• Front wheels and body angle: has the vehicle begun to angle into the turn?

Slowing, drifting toward the turn and starting to angle in all point the same way. A signal with none of those behind it is just a blinking light.

Four Questions Before You Commit

Suppose you’re waiting to make your own left turn and an approaching vehicle has a signal on. Before you go, work through these in order:

A few extra seconds are almost always better than committing to a manoeuvre based on a guess.

The Same Rule Applies Everywhere

Left turns across traffic are the classic example, but the habit applies any time you’re deciding what to do based on another vehicle’s intention:

• Entering traffic
• Changing lanes
• Turning at an intersection
• Entering a roundabout
• Pulling out of a driveway
• Crossing a lane of traffic
• Merging
• Yielding to another vehicle

Pulling out of a driveway

A vehicle approaching along the road has its signal on, so you assume it’s about to turn off before your driveway and leave the road clear. You pull out. It carries straight on, directly across your path. Wait until you can see where the vehicle is actually going.

Merging onto a highway

A driver in the lane beside you signals a move away from you, so you assume the gap will open. Check the actual space and speed instead. Our highway merging guide shows how to manage the gap yourself rather than depending on someone else making room.

Make Your Own Signal Worth Trusting

The drivers around you are reading your signal the same way, so give them something dependable to read.

• Signal early enough that other drivers have time to notice and react.
• Cancel your signal once the turn or lane change is finished.
• Signal only for the movement you actually plan to make.
• Don’t treat your own signal as permission. It tells others what you plan to do, but it doesn’t clear the space for you.

Common Mistakes

Going on the blinker alone

The problem: You see a signal and immediately decide the other driver will turn.

Better approach: Use the signal as a cue to look more carefully at the vehicle’s speed and position.

Forcing the other driver to react

The problem: You move into the intersection and the other driver has to brake or swerve to avoid you.

Better approach: Move only when your path is clear without needing anyone to adjust for you.

Waiting too long

The problem: You become so cautious that you hesitate even when the movement is clear, which confuses other drivers.

Better approach: Once the vehicle’s movement is obvious and your path is clear, go with a smooth, confident decision.

Ignoring signals completely

The problem: You decide signals don’t matter, so you miss useful clues about what’s coming.

Better approach: Notice every signal, then confirm it against what the vehicle is doing.

Signalling late or leaving yours on

The problem: Your own signal comes too late to help, or keeps flashing after the turn.

Better approach: Signal in good time and cancel it as soon as the manoeuvre is complete.

Practice Exercise: Signal Spotting

On a practice drive, make a point of noticing every other vehicle’s signal. Each of you has a job.

Your job

Whenever you notice a vehicle with a signal on, say out loud what you see in three parts: the signal, the movement and your decision. For example: “Signal on, slowing, moving toward the turn lane, so I’ll wait.” Speaking it aloud helps you check that your decision is based on movement and not just the blinker.

Your supervising driver’s job

Ask “What is the vehicle actually doing?” rather than telling you what to do. Note whether you waited for the movement to become clear, and talk it over once you’ve stopped. Supervisors can find advice on giving feedback in our guide to teaching a new driver.

Road-Test Connection

Road tests judge how you make decisions as well as how you operate the vehicle. Waiting until another driver’s intention is clear, and avoiding moves that force other road users to react, both show good judgment. For more on what examiners look for, see The Road Test: What to Expect.

The Bottom Line

A turn signal is a useful clue about what another driver may do. It is not a guarantee, and it never gives you permission to go. Watch the vehicle’s speed, position and movement, wait until the situation is clear, and keep your own signals timely and honest.

A turn signal tells you what another driver may intend to do. Their actual movement tells you what they are doing.