WRT treetop lighting, I dare say I saw the vast majority of lights in my eyes in 2015 between around Carhaix and Tintineac on the return. It was awful. Either the dynamo riders do not aim their lights correctly or there are a lot of non-dipped battery lights being used. In 2019, I slept at night and really have no impression other than seeing two (2) dynamo riders clip the curbs existing roundabouts (circles or rotaries). One French rider kept yelling, Merde, Merde, c'est le deuxieme frois ce soir or something like that as he lifted his bloodied body back onto the bike. Another one was a nasty crash with about a dozen riders going down. On a recumbent, I do not join pacelines so, I saw the whole thing. One rider leans in to turn and his dipped lights no longer illuminated the road to the right and he hit the curb and the other riders went down.