Today, I was driving on the highway with light snow but enough to slow traffic. During the drive my car hit a patch of packed snow and ice causing my car to veer slightly to the right. As I corrected my car, a tractor-trailer behind me flashed his brights at me.
What does this mean?
He had plenty of space between us, so I am not sure the cause of why he/she did this. Also, in the past I have had truckers flash me with the brights when I change lanes on the highway. I did not cut them off or give them any cause to be upset towards me.
Is there a secret signal for flashing vehicles I do not know about?