Owing to the sheer number of participants, a staggered start is necessary, with riders batched by race number and those with lower race numbers departing first. The first batch of riders depart at 0700 CET. Priority race numbers are given to a selected number of elite riders who have posted very good times in previous attempts or can provide evidence that they are capable of competing with the best riders. Non-elite riders that have posted good times in the past are also batched in the lower number range. Since timing does not begin until the rider has crossed the start line, theoretically there is no disadvantage to starting from the back of the field. However, since the faster riders depart first it is potentially advantageous to be batched in the earlier groups and take advantage of pelotons moving at greater speeds. In addition, the sheer number of participants can lead to congestion on the roads and at feed stations.