A rider who is not at the start line within a reasonable period of time is also liable to be disqualified, although league matches in the UK allow teams to elect to start the disqualified rider fifteen metres back from the tapes or replace the disqualified rider with a team reserve. This period of time is standardised to two minutes from a time determined by the match referee and usually indicated by a bell, a rotating orange lamp or a digital clock readout. All riders must be at the tapes under their own power before the two minutes have elapsed. Additional time between races will be allowed by, and at the discretion of, the referee if a rider has two consecutive rides, to allow the rider time to prepare.