Rules of the road

Freeway Driving

Merging, exiting, and driving safely at higher speeds.

Use the acceleration lane to reach the speed of freeway traffic before merging, keep right except to pass, and start planning your exit well before the deceleration lane begins.

A freeway merge is a speed-matching problem, not a gap-finding one: your job in the acceleration lane is to arrive at freeway speed, not to arrive and then hope for a gap.

Key facts

In the acceleration lane, you must increase your speed to match freeway traffic before merging, since freeway traffic already on the road has priority.
When exiting, signal for the deceleration lane first, then reduce speed only once you are actually in it, not before.

Merge at freeway speed, not before

The acceleration lane exists so you can match the speed of freeway traffic before you merge into it, not so you can find a gap at a lower speed and hope traffic adjusts. Signal your intent and choose your gap while you are still accelerating, not after you have already reached the end of the lane.

Some ramps merge on the left side of the freeway, which puts you directly into the fastest-moving lane; if your ramp does this, you need to build speed more quickly than usual to merge safely.

Keep right and manage your space

Keep to the right lanes for normal travel and use the left lane only to pass a slower vehicle, then return to the right. On a freeway with three or more lanes, large trucks are restricted from the far left lane entirely, which is one reason it should not be treated as a default cruising lane.

Scan 15 to 20 seconds ahead, check your mirrors frequently, and avoid lingering beside another vehicle for an extended period; staying in another driver’s blind spot removes your own ability to react if they change lanes.

Exit without a last-second move

Signal for the deceleration lane before you reach it, but do not reduce your speed until you are actually inside that lane; slowing down while still in a through lane creates a hazard for traffic behind you. Once in the deceleration lane, reduce speed gradually to match the posted exit-ramp speed.

If you miss your exit, continue to the next one rather than stopping, reversing, or attempting a last-second lane change across multiple lanes of moving traffic, all three of which are far more dangerous than the extra distance to the next exit.

Common mistakes

Merging at a speed noticeably slower than freeway traffic instead of matching it first.
Treating the far left lane as a normal cruising lane rather than a passing lane.
Slowing down while still in a through lane instead of waiting until you are in the deceleration lane.
Attempting a last-second cross-lane move after realizing you missed your exit.

Check your understanding

1. What is the purpose of the acceleration lane when entering a freeway?

To let you increase your speed to match freeway traffic before merging, since traffic already on the freeway has priority.

2. When exiting a freeway, at what point should you actually reduce your speed?

Only once you are in the deceleration lane, not while you are still in a through lane, since slowing down early creates a hazard for traffic behind you.

3. You realize you have missed your freeway exit. What should you do?

Continue to the next exit rather than stopping, reversing, or making a sudden lane change across traffic.