Today I put some white reflective tape front,
and some red rear, on a bike. Pointing a 38lm
flashlight at it from ~1.5m makes for a very
visible reaction.

The only downside was that the tape gave the
impression of not really sticking to the bike.
On the casette saddle-stay side, I had to clean
the stay with acetone before it would stick
at all.

--
underground experts united
http://user.it.uu.se/~embe8573