Assuming you aren't driving far, the police will generally understand, and appreciate your regard for their safety. I have seen people choose to pull over in the worst of spots, where I am almost certain the police would have appreciated them moving to a safer spot.

As for the Arkansas lady, did you watch the video? IIRC, she went quite a ways before he PIT'd her. I would agree he shouldn't have done the PIT on her so soon, but it wasn't the case of her going a few hundred feet more.