Caution for players in Accidents.

[Ghutra]

Well, unless people are blind, they can clearly see a massive pile-up of arrows on the minimap, which could mean (Kyoto for exmaple):
A) Stopped at RB because of an accident/chase/tow in progress/cars passing
B) Massive crash

Even without it, they still fail to brake when people is stopped at RB (I had like 1 or 2 crashes like this where it was my fault, but luckily the best was a dented rear end -saying sorry obviously-, and the rest were because people behind me didn't even brake and caused a major wreck).

Or for example, there is a chase on going on AB and a dude tries to overtake it, but just at that time the suspect/cop turns into the lane and ends up crashed because someone didn't even leave distance for the cop to chase (I have seen this many times). Ppl do anything they can imagine to overtake a crash/chase, or they don't move for sirens and either the cops gets blocked/slowed down and loses the chase, or ends up on a crash because the dude in front of him abruptly brakes or crashes the cop while he passes. I saw it by myself ppl tailgating cops on a chase or even being in between the suspect and the cop.

As Pete said above, people would end up ignoring it even more than they do now. It's like "Oooh, a caution/hazard sign, lets overtake it at 220kmh".