Baltimore cabs are The Worst. Meters are routinely rigged. When I lived there, I'd usually haggle on a fare before getting in the cab. Sometimes, I didn't feel like it and I'd take my chances. There was wild variance in the rates the meters racked up. Not only that, but cars are frequently in very poor shape and many drivers don't know where they're going in a city that's pretty easy to navigate. On top of that, at the time, credit card machines were unheard of, even after NYC had them in every single cab.