Tickling someone while they're driving isn't advisable. I don't recall that I've ever been tickled while I was driving, or that I ever tickled a girl who was driving.
The very first scene of the TV show "Dallas", in 1978, shows Victoria Principal and Patrick Duffy driving up to Southfork Ranch. Duffy is driving the car, and, as he's pulling into the ranch, they show from a long distance how Principal supposedly tickles him, and he sways the car all over the road, and nearly crashed into either a tree, or a fence. The shot was from a wide lens angle, so it was difficult to tell whether she really tickled him, or whether he just swayed the car intentionally, to act for the scene.
Does anyone else remember that scene? I think it is the only scene I've seen on TV that I can recall where someone was tickled while they were driving.
Mitch