Been up there twice in the fall, both right at the peak of the leaf turning. Last year was an absolute nightmare to drive through. We managed to schedule our trip on Colimbus day weekend without even thinking. The drive into Lincoln to get to the Flume Gorge and the Old Man site was at the breakneck speed of 5mph. People pulled over at every possible spot to look at the leaves, walking in the middle of the highway like it was no big deal, stop and go traffic almost the whole ride. By the time we got out of town, it had clouded over and was pouring rain. The Gorge was closed and the Old Man site was totally covered by the clouds. Ended up going to the Basin and walking in the rain. Which actually turned out pretty cool, but the rest of the day was miserable.