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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-
There are rules about support cars in CTT. They limit how often the car is allowed to pass a rider and you get get feeds from cars - it has to be a supporter on foot.
RAAM has a huge amount of rules for support cars - how many, how many drivers, sections of the route where the cars have to leapfrog, sections where they have to follow with their lights on... yada yada
Unsupported ultras are by definition not allowed to involve your own cars. If you gain draft advantage (and everybody does) from passing cars, it's hardly going to make enough difference in an ultra to implement rules about it and who would police it?
hippy
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/