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I have no idea about supported ultras, but I don't believe there is a rule in CTT.
Here's the RAAM rules:
https://www.raamrace.org/_files/ugd/49fb96_827b7e7cf8164604884e2c2594e1cc7d.pdfI don't see anything on a quick skim.
I expect UMCA / RAAM probably follow UCI in a lot of stuff, but presumably the impacts are a lot lower at RAAM speeds than world tour speeds, and RAAM is not decided by a few seconds here and there, so probably not a pressing matter for them.
frank9755
@nick_h.
Is there a rule about the aero boost from follow cars in ultra events? It's been known about since 2015 when this paper by Bert Blocken was published https://www.sciencedirect.com/science/article/abs/pii/S0167610515001531 This year the UCI brought in a rule that team cars must be at least 25m behind in TTs.
Even when the car obeys the 25m rule you can still get a gain, according to new research in a paper published last month by Bert. With 2 bikes on the roof carried sideways, the rider gains 2.5 secs over 22.4km at 36 kmh. If the car is 5m back the gain is 6.4 secs. (I hope I got this bit right.)
Details here https://escapecollective.com/are-bikes-on-the-roof-affecting-time-trials/