Broken Yellow, Wet Pavement, and a Pickup Already in the Passing Lane
You are driving a small sedan with three passengers east on a two-lane section of Route 2 near Truro. An afternoon shower has left the pavement wet, and the low sun is directly behind you. Ahead, the centre line is a solid double yellow; about 150 m before a crest it becomes a broken yellow on your side. A cyclist in a bright jacket is riding roughly 1.5 m from the right edge at about 20 km/h, and a roadside sign reads "Passing Lane - 1 km." In your mirror a pickup is following at about one second. As you close on the cyclist, the pickup swings out and starts to pass both of you. At the same moment, a loaded transport truck appears over the crest, coming toward you, and the cyclist's front wheel wobbles toward the centre of the lane. Your passengers are talking loudly, and one is telling you to "just go around."
1. What do the markings ahead allow, and what conditions must be satisfied before you move left?
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A broken yellow line on your side means you may cross it to pass when it is safe; a solid double yellow means neither direction may pass. The broken section is only about 150 m long and it ends before the crest, so any pass would have to be completed before the line reverts to solid, with enough clear sight distance to see oncoming traffic. At combined closing speeds of 150 km/h or more, sight distance over a crest is usually not there.
Right now three facts make a pass unsafe regardless of what the paint permits: the pickup is already occupying the oncoming lane to pass you and the cyclist, so the space you would need is taken; the oncoming truck will meet that pickup near the cyclist; and the cyclist is drifting left, which means you need to hold back and give room, not crowd. The law permits passing; it never requires it. A legal pass that is not safe is still a crash. Wait for the passing lane signalled 1 km ahead.
2. The pickup is now alongside the cyclist and the truck is closing fast. What do you do in the next few seconds, and why is braking usually the better response than swerving?
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Lift off the accelerator and open a gap behind the cyclist instead of closing on them. Do not follow the pickup out - if the truck forces it back, that driver will need your lane and you do not want to be there. Cover the brake and be ready to stop within the distance you can actually see.
Swerving right is the tempting mistake: the shoulder is wet grass and gravel with far less grip than pavement, and dropping a wheel off the edge at speed often ends in a spin or a rollover. Braking in a straight line is a controlled outcome; an off-road excursion at 80 km/h is not. Keeping your wheels straight and your speed low also preserves the option to move left later if the truck clears and the cyclist stabilises. Your passengers' urgency changes nothing about the physics - the space you would need is occupied by a driver taking a risk you cannot control.
3. One kilometre later the passing lane opens. What two things could still make it unsafe, and how do you sequence the pass?
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First, the pickup may already be in the passing lane, or a faster vehicle behind you may claim it - passing lanes are shared, and drivers often accelerate as they open. Second, the lane has a limited length before the taper merges back, so on wet pavement with spray you need enough room to complete the pass and return without a hard merge.
Sequence: interior mirror, right shoulder check, signal early, confirm nobody is overtaking you, then accelerate smoothly. Give the cyclist at least a metre of lateral clearance, more at highway speed, and leave a gap that lets you pull back in without cutting anyone off. Return only when you can see the headlights of the vehicle you passed in your mirror, cancel the signal, and rebuild your following distance. Do not exceed the limit substantially to make the pass fit - if the geometry only works at 120 km/h, it does not work. If any element fails, stay behind and wait for the next opportunity.