sirius07
OK interesting idea, but I honestly cannot see how it can replace or better, good observation skills ? I can see that an additional warning device may help alert others to a problem, on rare occasions, but, there are 'problems' such as :
a) What if it is a nearby road but will not 'effect' those then then get a warning but cannot see any incident? They may assume 'another' false alert.
b) If it is within 100m/yds or so then it is likely that most will see the incident anyway and so need little warning of it.
c) Those that are further away, and are unaffected, other than that they have had to slow / stop for 'something ahead' will (now-a-days) likely get a warning on their 'live' traffic incident warning systems fairly quickly.
d) On a motorway then it might help in fog, or round a corner but ... (they ought to be going carefully anyway) ...
e) it may lead to some people relying on it and assume it is all safe to proceed - thus make people take less care in good and proper observation skills.
f) What if it is a 'softer' (road side furnishings / people etc) accident, will it work then? How much 'shock' does it require to work and conversely what about going over pot holes, and setting it off as a false warning ?
g) If a person has to either ever activate it or indeed to turn it off, will they realise it is on in the first place ?
h) how 'fast' can it warn ?
I don't know about the electronics interfering with other frequencies, or devices, that would have to be investigated. You may need a license for this as it would be in the public domain. Also listing it publicly may prevent some investment potential and it is always wise to patent / copyright / trademark / etc products before making them public so I hope that you have already done this ?