Decreasing-Radius Curve with Mid-Corner Gravel
Priya is riding her 2018 650 cc adventure bike east on Highway 11 at 95 km/h in a 100 km/h zone. She is following a friend's taillight through a right-hand curve posted at 70 km/h. As she enters the curve, the radius tightens and a patch of loose gravel covers the inside half of her lane from the apex to the exit. She is already leaned about 30 degrees, has two fingers on the front brake, and is in third gear at about 4,000 rpm. Her rear tire begins to slide a few centimetres to the left. There is no oncoming traffic, but a guardrail is close on the outside. Priya's friend is now 1.5 seconds ahead and accelerating out of the curve. Priya has ridden this road twice before, but never with gravel present.
1. What should Priya have done before turn-in, and what is her best immediate response to the gravel?
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Before turn-in, Priya should have reduced speed to at least the 70 km/h advisory, ideally a little lower, because the curve tightens and she had not scanned for gravel. Following a taillight encouraged her to match speed rather than ride her own pace. At the gravel, grabbing the front brake would add lean-angle demand and risk a front-wheel slide. Her best immediate response is to avoid sudden braking, keep a steady throttle, look toward the exit, and use the cleanest available line, likely outside the gravel patch if she can do so smoothly. She should not stand the bike up abruptly into the guardrail; she needs a gentle reduction in lean angle while preserving tire grip.
2. How should Priya manage the rear slide and her body inputs?
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For the rear slide, smoothness matters more than a dramatic correction. She should keep the throttle steady, avoid chopping it, and not stab the rear brake. Her body should stay relaxed and centred, with weight on the pegs and eyes up and through the curve. If the slide is mild, the bike will often stabilize as it passes the gravel. If she must reduce lean, she should do it gradually while staying off the front brake. A sudden release of the throttle or brake when the rear regains grip can cause a high-side. The guardrail means she should plan an escape but not fixate on it.
3. What group-riding decisions increased Priya's risk in this situation?
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The group decisions raised risk: following a taillight at 1.5 seconds left too little time to scan for gravel, and matching a friend's acceleration encouraged a speed she had not independently chosen. She had only ridden the road twice, so she should have given herself more margin, especially with a tightening radius. Riding in a group does not transfer responsibility for line and speed to the leader. The friend accelerating away also increased the pull to catch up. Priya should ride her own pace and use a larger gap when the road surface is uncertain.