Lapping traffic can be a royal PITA....but it's one of the challenges of being fast.

I agree that if you're about to be lapped then let him pass by either going out of your line a little or just let up on the throttle slightly. Sure it sucks if you're the one being lapped, but don't try and race the guy and end up crashing him or yourself.

Often the people being lapped are less experienced (or have a crap setup) and as a result can be all over the track and have no real line. Accidents at times are inevitable and just a fact of racing. Since some people like to make an example of Formula 1, a lot of crashes there are a result of other cars' actions....same goes in RC.