By tailgating the car the fire truck driver blocked the car driver’s rearview and side mirrors so they would be unable to tell if it was safe to move over into the right lane. So they moved over to the left turn lane when one was available.
I bet the driver was a woman, was totally frightened by the fire truck on her tail and was driving in panic mode. The fire truck driver is a total putz. I hope his azz stays fired.
You bring up a very good point with that comment. I stay way back from 18 wheelers so I can see what is on the road ahead. That is one reason many of them have the:
If you can't see my mirrors, I can't see you.
on their rear doors.