Following a Snowplow at Night
It is 11 p.m. in January and snowing steadily. You are driving a light truck on a divided highway posted at 100 km/h. A plow truck with flashing amber lights is ahead in your lane, spreading sand and leaving a plume of snow dust that reduces visibility to a few car lengths. The plow is moving at about 45 km/h. Your headlights are on low beam; high beam makes the snow glare worse. Your tires are all-season with moderate tread. The road surface between plow passes is partly ice. You are tired after a long shift and the heater is making you drowsy.
1. How should you position yourself relative to the plow, and why?
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Stay well back - far enough that you are outside the snow plume and can see the plow's lights and the road ahead, and not so close that you are in its blind spot or in the sand being thrown. Do not pass a working plow unless you can see clearly ahead and have room; the plume hides ice and debris. If you cannot see past the plume, increase the gap until you can. The plow is clearing your lane, so following at a safe distance is usually the safest option in these conditions.
2. Your speed, tires, and fatigue all interact here. What adjustments are required?
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Reduce speed well below the 100 km/h limit - the posted limit is a maximum for ideal conditions, not a target in snow and ice. All-season tires with moderate tread lose grip on ice, so braking distances grow dramatically; increase following distance to several times the dry-weather gap. Fatigue is a safety hazard: drowsiness impairs reaction time much like alcohol. The correct call is to pull off at the next safe exit or rest area and stop for a rest, or switch drivers, rather than push on. Turning down the heat and opening a window is a temporary measure, not a fix.
3. Another driver tailgates you closely. What is the safest response?
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Do not brake-check or speed up beyond what conditions allow. Maintain a steady, predictable speed, increase your own following distance to the plow so you have room to slow gradually, and let the tailgater pass when it is safe. If they will not pass, consider changing lanes or pulling over to let them by. Your priority is a smooth, slow, predictable path on ice.