That would do nothing. The way reflective tape works (and street signs) they reflect direct light back to the source. You can test it yourself, walk around at night with a light source near your eyes and look at a stop sign. This works at any angle. Now get a friend to shine a light at a 45 degree angle and you'll see a HUGE difference. It's called
Retroreflection.
Here's a better explanation
http://www.roadtrafficsigns.com/reflective-traffic-signs