The woman in the little white car wants to merge so he lets her. He tries to let people merge whenever feasible, especially trucks – just working guys, he figures, trying to do a job; the guy in the dump truck waved his thanks. The woman in the white car waves her thanks, as well. He waves back. Don’t mention it, he thinks, I can use the karma, and that semi in front of you is losing ice off the top in chunks like a cross between Frisbees and Louisville Sluggers.