I think their express desire to not let anyone pass was a function of them pursuing someone ahead, or a possible a fire/hazard/explosives in transit or something to protect drivers from themselves. I once was the first car at the George Washington Bridge tollbooth after the bridge was closed to allow transport of explosives across the span and I was all ready to go 100 mph unimpeded across. Two cop cars spanning all three lanes get in front of the tollbooths and release everyone at exactly 40 mph across. It isn't their first rodeo. Your girlfriend is a typical douche who thinks she's so important, she simply must pass everyone, including those trying to protect her.