So why are Marylanders bad drivers? It seems strange that they should be different from neighbouring states.
I don't have a good answer, but one theory I have is that many of the residents of Maryland's Prince George's County (and Montgomery County) grew up in D.C. and either chose to move (due to D.C.'s rough couple of decades, or they decided to cash out and sell their homes) or effectively were forced out due to rising prices. Many of these people likely did not own a car while living in D.C., so their experience driving came later in life, and so they just aren't good at at.
However, this theory does not explain why drivers are bad in some other parts of the state. While riding in a car driven by a friend of mine who grew up in Baltimore County, I noticed she aggressively would accelerate to block other cars from merging when they signaled their intentions ahead of time. I asked my otherwise-reasonable friend why she would do such a thing, and she responded that when learning to drive, she had been taught (by her parents, I assume) that someone else's use of a turn signal should be your signal to block them from executing that lane change and get some kind of space advantage over you. Amazing.
