Do something like this in a helmet for riding....imagine maybe a LED blinker for Left and right turns that would be synced up with GPS that would let you run a programmed route. one blink for 1 mile 2 blinks for 1/2 mile and so on...we all know speed and direction...
Either goggle form or within the visor of a full or 3/4 face helmet...
http://www.designnews.com/document.asp?doc_id=247499&cid=NL_Newsletters+-+DN+Daily