In the UK, is there any (legal or similar) limit on bike+trailer length?
I can't find a legal requirement specific to bicycles anywhere.  There are width restrictions but not height or length restrictions for bicycles.

It would be "reasonable" to have a trailer no-longer than a trailer towed behind a motor vehicle so there's an existing precedent already set.

Basically length is governed by the corners you want to go around.  So a silly-long trailer combination becomes impractical on a bike path with chicanes or a small road.

Taking reasonable precautions with flags and additional lighting (even in daytime) will mitigate risk.


From https://can.org.nz/node/12541


From https://www.cycletrailers.co.nz/

(I know the maker of these trailers personally but have no other connection)