Yes I think there is no need for backmarkers to go off track, the lead guys will find way around clean as long as you dont defend your position or do anything unpredictable. When the cars being lapped are off track it costs them heaps of time and even the cars passing will need to slow more as they need to take more care because its very hard to predict what the car will fo out there and if they crash may spin back onto the track. Best to hold your line and if the car behind moves to one side just give them that line into the corner. If you then have less track to use you need to slow more to make sure you stay on track at the exit and possibly leave room for cars that may still be alongside. Key thing to avoid is unpredictable lane changes or lifting off sooner while a car is following. Once they pull put and nobody is directly behind lifting earlier into a corner holding the inside or outside line normally works best for both cars. There will be some sections of tracl where pass8ng isnt likely and thats just the thing with traffic. Lead cars should not be punting slower cars off track and always pass cleanly even if it means losing some time. When 2 or more cars are lapping someone its trickier so everyone needs to be more aware at these times but still cars shouldnt have to drive in the dirt.