Get it straight. It is going faster than the speed limit that creates extra conflict points for accidents. That's the problem. If better enforcement is needed via cameras, radar, etc, then that's the solution....not everyone speeding. Speed kills.

Just slightly over half of US states require you to move right to yield to faster traffic. In some places it is completely allowable to drive the speed limit in the left lane.

https://www.mit.edu/~jfc/right.html