The Merge Lane That Runs Out
You are entering a freeway from an on-ramp that becomes a short acceleration lane. Traffic on the freeway is moving at about 65 mph in the right lane. Ahead, a semi is in the right lane at 60 mph, and a gap exists behind it but is closing because a car behind the semi is speeding up. Your acceleration lane has about 300 feet left. Your speed is 45 mph. The car behind the semi is now alongside your rear quarter. There is a solid white line to your left that will end shortly.
1. What is the correct sequence of actions to merge safely?
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Use the remaining lane to build speed toward the flow of traffic rather than entering slowly, because a slow merge forces freeway traffic to brake and creates conflict. Signal early, check mirrors and blind spot, and target the gap behind the semi. The car alongside your rear quarter is the constraint: do not steer into it. Either accelerate to get ahead of it into the gap, or if that is not possible, adjust speed to fall in behind it. The solid white line means stay in your lane until it ends; do not cross early.
2. If you run out of lane before a gap opens, what do you do?
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Do not stop at the end of an acceleration lane on a freeway; a stopped car in a live lane is a severe hazard. Slow and, if truly necessary, use the shoulder to continue rolling while you find a gap, then merge when clear. The better outcome is to have matched speed early so a gap existed. Merging traffic yields to freeway traffic, so the responsibility to find the gap is yours, but the safe failure mode is the shoulder, not a dead stop in the lane.