How do I build my own emergency lighting?

Question

I work for DOT and frequently assist stranded motorists in my off time. I would like to build my own LED flashing amber/white lighting to improve my vehicle's visibility on the side of the roadway. Where can I get the components I need to do this? I'd like really bright LED and IC's that will regulate flashing. Where can I get these?

Answer 1

http://www.pentagondefense.com/emhifl.html

Answer 2

Auto parts store.....
Emergency Vehicle lighting....LED, bright, flasher built in.