Wet Rain Grooves on Kalanianaole Highway
At 6:10 p.m. in light rain, a rider on a non-ABS 2018 600cc motorcycle is westbound on Kalanianaole Highway at 40 mph. The rear tire has about 2 mm of tread left, and the lane ahead contains a steel utility cover and a freshly painted left-turn arrow. A pickup is 1.5 seconds ahead. In the oncoming lane, an SUV waits to turn left across the rider's path; its wheels begin to creep. The rider wants to turn left at the next signal about 200 feet ahead. Traffic behind is close. The rider must decide whether to brake, swerve, or hold lane position while managing wet pavement, a worn rear tire, and a left-turning vehicle that may cross the lane. The rider has no ABS and is not sure whether the front brake will lock. The speed limit is 45 mph.
1. Rank the three main hazards in this setup and explain how each one changes the rider's available traction or time.
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The left-turning SUV is the highest immediate hazard because it can cross the rider's path and remove the rider's escape space; it is a path-intrusion problem, not just a traction problem. The wet steel cover and painted arrow are second because they sharply reduce traction exactly where the rider may need to brake or turn. The worn rear tire is third but amplifies both: with only about 2 mm of tread, water evacuation and braking grip are already limited, so the rider has less margin on the cover and less reserve if the SUV moves. The ranking is not fixed: if the SUV stops, the cover becomes the dominant hazard; if the rider must stop quickly, the tire and wet surface combine. The key judgment is that these hazards stack, so the rider should reduce speed early rather than test the front brake at the last moment.
2. If the SUV continues to creep, what is the best immediate response? Explain braking versus swerving and lane position.
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The rider should first roll off the throttle, cover both brakes, and apply progressive pressure to both brakes while keeping the motorcycle upright. On a non-ABS bike with a worn rear tire and a wet steel cover, grabbing the front brake risks a front-wheel lock; the rear brake alone risks a rear-wheel skid. If there is enough distance, straight-line braking before the cover is safer than swerving while braking. If the SUV blocks the lane, the rider should look for an escape path behind the SUV rather than in front of it, and swerve only after shedding enough speed to keep the bike stable. The rider should not fixate on the SUV; the eyes should go to the gap. Lane position should avoid the painted arrow and cover if possible, but the rider should not swerve into oncoming traffic to avoid a surface hazard.
3. How should the rider adjust following distance and lane position before the intersection?
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The 1.5-second gap is too small for wet pavement, a worn rear tire, and a left-turn conflict. The rider should open it to at least 3 seconds, and more if traffic behind permits, so there is time to brake progressively instead of reacting late. In the lane, the rider should avoid the center strip where oil and water collect and should use a tire track that gives a cleaner path, while staying visible to the pickup and the SUV. Before the signal, the rider should cover the brakes, scan the SUV's wheels and driver, and set up for the left turn from the correct lane rather than drifting across lanes. The rider should also check the mirror before slowing, because close traffic behind can turn a smooth stop into a rear-end risk.