I was thinking about clear driving lines while driving in gravel roads last weekend, at first the road was very slippery but as we drove the same road section few times, a line formed where there was more grip, but only the narrow line, outside it was still very slippery.

I remember someone, (Mickey T i think) saying year ago that a single narrow clear line is a bigger reason for lack of passing than aero regs.

Could it be possible to remove the clear line before a race so that there is similar grip everywhere?

A single line would eventually form as driver use the fastest way around corners, but it could help with early laps boredom what we now get after the second lap. It would help with starts too where often guys who are in position 2,4,6.. are hampered by their position a compared to guys from p 3,5,7.