Art Is...

My mom had one of these 🪶

this is also true in the UK! a cyclist or motorcyclist will signal the same thing by tapping the top of their helmet.

Also if the vehicle in front of you puts their hazards on - they may be indicating to you that they can see something ahead you can’t, they may need to stop unexpectedly, or they may be about to do something else you won’t expect (for example, reverse park in the driveway on the other side of the road, so they need the other traffic to wait at a short distance while they complete the manoeuvre).

I also flash my brights when driving on the interstate and a semi needs to get over to let them know there is enough space in front of my car for them to do that. They will often do it in return as thanks.

My mom taught me these and I made sure to pass it on to mine.