Given the opportunity, suspects will lead you as far off the beaten path as possible, or at least to a location that provides them a situational advantage.
Example: A day shift deputy finds a vehicle's driver taking an inordinate amount of time to pull over, and when he does, it's beneath a darkened overpass. It occurs to the deputy that perhaps the vehicle's occupants are angling to get him in an area that will offer few witnesses to whatever surprise they have planned for him. He elects to wait for backup and have the people exit the car, rather than approach the vehicle himself. After the men are successfully detained away from the vehicle, a search of it finds a number of firearms inside.
Remember: You pick when and where they're going to stop. If they don't stop until your vehicle and theirs are in a relatively isolated area, don't approach the car until you have sufficient backup on scene. The driver can pitch a bitch about the imposition all he wants, but has nobody to blame but himself.
If you do find yourself in such a situation, you're probably going to have some time waiting. Make repeated commands over the P.A. to get the driver to do what you want him to do. And if you suspect something bad is in the air, tape these commands. Such evidence can go far to display both your attempts to get compliance and their refusals.
And things can go south in a hurry. Watch those telltale brake lights. More than one suspect has put a car into reverse and hit the gas with the intention of activating the officer's airbags.