Last year my brother was involved in a serious motorcycle accident, he was riding home alone from work when(unknown reasons) lost control and was thrown across a 4 lane highway. it was not until a passing motorist came by that emergency personel was contacted.
I have been toying with the idea of a pager sized device that could be worn on the belt or attached to a motorcycle. that could operate like onstar or similar to the life guard that fire fighters wear.
The device would need to be able to detect an impact with minimal false positives, have some form of location sensing, a way to alert emergency personel, and must survive an accident.