First Rain, Tram Rails, Painted Arrow and Grit
It has rained for the first time after three dry weeks. You are riding at 45 km/h along a city street where a tram line curves across your path: the rails cross your direction of travel at roughly 30 degrees. Just before the rails, a large white directional arrow is painted on the asphalt. The rails are wet and shiny. A building site on the right has a dusty exit, and a film of sand and grit has been washed across your lane, thicker near the kerb. You are following a car at about 15 m. The rider behind you is close enough that his headlight fills your mirror. As your front wheel reaches the first rail you feel the front step sideways a few centimetres, and your instinct is to grab the front brake lever. The nearest point where you could meet the rails at a wider angle is 30 m further on.
1. Explain what has just happened and rank the hazards you are dealing with.
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The front tyre has lost grip on wet steel. Two things combine: the rail is smoother and harder than asphalt, and the first rain after three dry weeks lifts a film of oil, rubber and dust off the road surface and floats it - so the road is at its most slippery in the first 20 to 30 minutes of rain, long before it looks dangerous.
Hazard ranking for the next two seconds:
- The brake lever. Grabbing the front brake on a rail or painted marking is the highest immediate risk: the wheel is already sliding, and a locked front wheel on steel means you are down. This is the one thing that turns a wobble into a crash.
- The rails themselves, crossed at a shallow 30 degrees, which lets the tyre track along the groove or slide out sideways.
- The painted arrow, which is as slippery as the rail when wet.
- The grit from the site, which behaves like ball bearings, especially near the kerb.
- The rider behind, who is following too closely and will have less room than you to react to anything you do.
The car 15 m ahead is a buffer, not a threat - but only if you leave it there.
2. Describe exactly what you do with the controls from the moment the front steps sideways until you are past the grit.
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Nothing abrupt. The bike is already moving; the job is to let it recover.
- Do not grab the brake. Ease off the lever if you have already touched it, and keep the throttle steady or very slightly closed. A front wheel that is rolling has a chance to grip; a locked one does not.
- Stay off the lean. Straighten the machine as far as the lane allows and keep the bars relaxed. The bike will usually cross a rail by itself if you do not add steering or braking input.
- Look up and past the rails, not down at the front wheel. Target fixation on the shiny strip is how riders end up on it.
- Cross the rest of the rail and the arrow without any control input, then, once both wheels are back on asphalt, slow gently and upright before the grit.
- In the grit, reduce speed before you reach it, stay off the kerb line, keep the bike upright and avoid braking or turning on the loose film.
If you had seen the 30-degree crossing in time, the better plan was to slow early and take the 30 m point where the rails can be crossed closer to a right angle.
3. The rider behind is pushing the pace and later says you should have braked later and leaned more. How do you answer, and what do you do about the site exit?
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Leaning more on wet steel is not a technique, it is a gamble. A tyre has a fixed amount of grip to share between cornering and braking; on a wet rail that budget is tiny, and asking for more lean simply spends grip you do not have. Braking later would have meant braking on the rail, which is the exact input that causes the fall. The correct answer to him is that the pace is set by the worst surface in the next 50 m, not by the best.
On the group: signal the hazard early - a downward point with the left hand as you approach - and slow before the rails rather than in front of them, so the rider behind is not forced into a mid-rail reaction. If he still sits on your wheel, wave him past at a safe place or pull over; a tailgater removes your ability to brake progressively.
On the site: the grit is a road hazard created by a commercial exit. Note the location and time and report it to the city road authority and to the site operator, so the exit gets a wheel wash or sweeping. That is cheaper than the next rider's collarbone.