Reflector shader? (not reflection)

Does anyone know of a shader that works like a typical reflector does, as in it lights up super bright when a light is directly hitting it and the camera is looking at it from the correct angle, otherwise it stays normal?

As in this type of reflector: http://www.deflecto.com/products/pc/catalog/hi-res/reflectors/40-0120-21.jpg

Isn’t it a simple shader with a very low glossiness ? Or maybe you could send the position of the light to your shader, create the vector (pixel, light) and dot with normal. Won’t work with several light though.