Product for notifying other riders of emergency?

[JakeSkump]

So I was just thinking if there is a product out there you could use in multiple vehicles to notify your friends of an emergency.

Ive got a couple of radios that we use to communicate while riding. Between music, engine, and/or wind noise they don’t exactly do the job unless stationary or expecting communication.

Does anyone know of any products that use a light indicator of sorts? My thought is a dash mounted device, either one light or multiple lights assigned to each vehicle, that illuminate on all vehicles when someone has an emergency.

[T-boss 410]

There are radios manufactured that include an emergency button that notifies others with the same radio of an emergency. These radios come in both a portable (walkie talkie style) and mobile (mounted) units. However, these radios are VERY expensive, like $5000.00 each. These are used in law enforcement, so I don't know how available they are for the public. There are probably other ways to do this, but I'm not a technician.

[Joe Breaux]

but what if none of your friends are there? something to attract attention of any other riders might be better .. like boats, we use airhorns in emergencies .. but now, most cell phones work just about everywhere