It's pretty straight forward, if your having trouble with the time, just run down as many pedestrians as possible while going toward the next goal for the traditional style you do for Angel. Each person adds 5 seconds, while hitting cars only gives you 2.
For the Decker's Tron style ones, just floor it while hitting the tanks and missing the fire and you should be fine. There's only one path instead of having to decide where to turn like on the normal ones.