Unmarked railroad crossings are often protected by the train crew throwing red flares onto the road before crossing, as per this video.. at 1:19 in
I have been trying to work out how to do this and came up with these
Fibre optic shoelaces :) about £5 of ebay for a pair (2 light units)
hole drilled in the road and the fibre optic rubber "lace" pushed up from underneath, bit of paint and a piece of wire for the flare body..
and here they are in action