I was thinking, it would be pretty cool if we could have an active RD database, which was live while we drive. However, it would really work best if the top mfgs worked together to use the same system. Here's what I'm thinking:
The RD would/could have a button labeled LEO, or more conspicuously "spot" or "mark", when pressed, it would load your current GPS local to a db which would store that spot for a specified time 30/60 minutes. Then, when anyone else using an RD with this technology drives through that location, a different type of alert would notify "Marked Location" (or something of that nature). And, if they were nice, they too would press the button if the threat was still active.
There are a few reasons for the time limit:
1) it would kill alerts made by people just messing with their RD
2) it would kill alerts for LEO's which have moved
This would be the ultimate in I/O protection.
RD mfgs could advertise it as some sort of "Road Hazard Warning System"; allowing us to warn others of "Road Hazards" which may lie ahead.
Heck, I might even be willing to pay a minimal monthly subscription for a service such as this. Did I just say that