I find these in my yard alot. But they usually look really moist and shiney. They are larvae from japanese beetle, so i'm told. they feed on grass roots and such. They will generally curl up when disturbed, that driveway was most likely too hot for his liking. Nasty looking things thats for sure.

It would have to be a larger species similar to this one that also is a back crawler. Some large scarab grubs go on a fresh air "romp" at times, perhaps before they pupate.