DPS will sit in unmarked cars on side of road in plain site (usually red/black color, no hazzard lights on, dark tint). Units will tag cars coming over the hill (hills on either side of Princeton) and call ahead or personally pull you over if other unit is busy. Lots of tickets on this road since it’s new, wide, open and fun to speed on through the country. Not sure how so many people get caught – a large tinted sedan on the side of the road should be enough to cause suspicion – but it works anyhow…