Yellow Center Lines, a Passing Zone, and a Slow-Moving Vehicle
You are northbound on a two-lane road at 55 mph behind a farm tractor moving at 15 mph. The center line is a solid double yellow, but about 300 feet ahead it changes to a broken yellow line on your side. The road curves left just past the start of the broken line, and you cannot see around the curve. A sign on the right is a yellow diamond with a black arrow curving left. There is a driveway on the left 200 feet ahead. A car is visible in your mirror about 4 seconds back. You have been following the tractor at about 2 seconds.
1. Does the broken yellow line make it legal and safe to pass here?
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A broken yellow line on your side of the center line means passing is permitted if it is safe, while the solid double yellow before it means no passing. But permission is not the same as safety. The broken line begins just before a left curve, and the yellow diamond with a left-curving arrow confirms limited sight distance through that curve, so you cannot see oncoming traffic far enough to complete a pass at a safe margin. There is also a driveway on the left 200 feet ahead, which is a place where a vehicle could turn across your path. The correct answer is no: the marking permits passing in general, but the sight distance and the driveway make this specific pass unsafe. Wait for a straight section with clear sight distance and no driveways or intersections.
2. How should you manage the following distance and the car behind you while you wait?
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At 15 mph for the tractor, a 2-second gap is short in distance but the speed differential is the real issue: you are closing on the tractor slowly, so a 2-second gap is workable but you should back off to 3-4 seconds to preserve view and braking room. The car 4 seconds behind you is not tailgating badly, but if you brake hard it will close fast. Keep a steady speed, avoid sudden stops, and signal early if you decide to pass later. Do not wave the car around, and do not pull onto the shoulder to let it by unless the shoulder is clearly wide and safe. Patience here is the correct judgment: the curve and driveway make an aggressive pass the highest-risk choice available to you.