Watch out for potholes, ridges, bad pavement patch-jobs, rocks, car parts, etc., particularly when riding on narrow racing tyres, as these can trigger a high-speed crash.
My most recent crash was at 10kph/6mph, on a slight downgrade, on a wet car park driveway. This is one scenario under which one should use both brakes simultaneously and gently; I locked the front wheel and immediately went into an unrecoverable skid.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069