Ease up coke-heads this is not for you.

Both climbing and descending my local mountain TT today ( in a PBT ) I noticed my tyres made much less noise when I deliberately rode on the white line at the edge of the road. Presumably due to less rolling friction.

So is this a useful tactic for roadies, in TTs at least. ie. Try to spend time on the road edge white line if there is one.

And since road markings are more slippery...

I recall Mick Doohan had a career ending crash when his Honda slid from under him due to riding on a white line.

Do the pros avoid hitting the white lines on descents for fear of sliding off on bends?

Bear with me, I'm new to this roadie lark.