ARTICLE 23|TEAM TIME TRIAL STAGE For stage 3, which is a team time trial, teams shall set off at 5-minute intervals in reverse order of the general team classification established after stage 2, except for the team of the race leader, which shall start last. The stage classification for each team is based on the time taken on the
fourth rider to cross the finishing line (recorded to 1/100th of a second).
Real times are applied to the general individual classification as follows:
• The time of the fourth rider in each team shall be awarded to all riders finishing in the same time or a faster one.
• Real time for slower riders.
• However, riders who finish after the deadlines set in the rules (coefficient 7) are disqualified.
http://netstorage.lequipe.fr/ASO/cycling_tdf/tdf2018-reglement.pdf