jefmcg
Guru
Caveat: the last tri I did was (ahem) in the 90s, so I may be uninformed as to current practices...Was there no ride lead car
I don't lead car makes any sense in a triathlon. The group is very spread out, so the car would likely only be leading just one rider, and would probably done little to alleviate this situation - or a similar one where a rider unknowingly joins the route of a triathlon. The lead car would be long past, but there will be slow swimmers trying to make up time in the cycle and run.
Signage and proper briefings - no excuse. It's not like thy can't afford the cost of a laminator....