sag wagon n. at a bicycling event, the vehicle which carries bicyclists who have withdrawn from the event (due to injury, bicycle malfunction, tiredness, etc.) (source: Double-Tongued Dictionary)
Further reading
A librarian opens a book and finds a mysterious invitation scribbled on the back of a business card. Another discovers a child’s letter to the Tooth Fairy, tucked into a book decades ago. What stories are left untold by these forgotten...
When she was a child, Chris from Santa Rosa, California, misunderstood the definition of the word vehicle—with amusing results. This is part of a complete episode.
Related
originally known as a “voiture balai” French for “Broom Wagon” which ‘sweeps up’ cyclists who have ‘thrown in the towel’. This van follows the tail end of the motorvehicle entourage daily following the Tour De France and other major races.