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

http://www.youtube.com/watch?v=td-Zz8UdLTs

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

http://www.youtube.com/watch?v=Mg3eUTpHOOo&hd=1

John