When someone lets me cut in on their lane, I make it a point to raise my hand to acknowledge their kind gesture. I appreciate it, too, when they do same when I let them in. A favor deserves a thank you –in whatever form one can manage. It really does make my day when I see bus drivers raise (or wave) their hands when another lets them in. There’s nothing like a little road courtesy and kindness to keep the good vibes going.