It's a situational judgement call. A female, alone, at night on a lightly traveled road would be foolish to stop. The 911 call and driving straight to a fire station or other well lit location with people around would be most prudent and the "reasonable person" test would surely prevail.
A vehicle with multiple occupants in a situation where other motorists or people are around should probably stop immediately.
Again, an immediate call to 911 would pretty much trump everything else as far as proof of non-intent to flee, as would putting on emergency flashers, a wave or other gesture to the LEO indicating you see him and intend to comply.
Unfortunately, the media, starting with Rodney King and continuing adinfinitium, have cause the average citizen to fear and mistrust LEO's more than ever in our history. We see the few bad episodes (and some that are not so bad but are made to look that way) repeated over and over. It's crap, but most people believe it as gospel.
The second most dangerous situation for a LEO (after a domestic disturbance) is a traffic stop. Standing alongside a busy roadway is not their idea of a desireable situation. Most LEOs dislike working traffic and writing tickets -- they would much rather be catching burglars or other BGs.
Don't let your ego get in the way when dealing with a LEO. You can't win on the street. You're far better off complying with the LEOs directions and then taking your problems to department management or the courts. The LEO interacts with citizens numerous time per day. The average person interacts with a LEO once every couple of years, and generally, the situation does not have a positive resolution as far as the citizen is concerned (i.e; you get a ticket or worse). Most LEOs understand this and want the encounter to be as brief and simple as possible. They really don't want to listen to your interpretation of the law. There are, of course, the few that trip on power and want to jerk you around, just because they can, but fortunately these are rare, although they do have an inordinate negative impact on the publice perception of law enforcement in general. The professional LEOs dislike these jerks more than the citizens do.
In the few traffic interactions I've had with police, I immediately acknowledge them and stop as safely a possible, pulling onto a less busy side street or getting as far away from traffic as possible. The veteran officers understand and appreciate it. I had one rookie get bent out of shape because I didn't stop immediately. After he cooled down and listened to my explanation, he expressed understanding and appreciation for my concern for his (and my safety).
BTW, my credentials -- I spent a number of years as a military and civvy LEO and then in emergency management. Graduate of two major academys, a BS in the field , and lots of time on the street.