MARK Cavendish produced a steady start to the Tour de France in Saturday evening’s prologue time-trial in Rotterdam. With heavy rain playing havoc with the 8.9-kilometre course through the streets of the Dutch city, Cav, along with many other riders, opted for a safety-first approach as he kept one eye on tomorrow’s (Sunday) 223.5km stage between Rotterdam and Bruxelles in which he is expected to challenge for honours.