I have seen other posts that get into checkpoints. Off the top of my head, if you can legally turn around (not breaking any U turn laws etc) and avoid the check point technically that isn't sufficient RAS for them to chase you down. Of course the police may not see it that way and may chase someone down that attempts to avoid the checkpoint anyway. :-(
If you are driving and are asked for license and registration you need to provide them since driving is a priviledge not a right. Other than that you don't have to answer any questions. Depending on what they are looking for (DUI, license check, legitimate-bad-guy-on-the-run) your silence or non-cooperation may have the LEO take you downtown. This pain-in-the-a$$ technique in my opinion is simple intimidation since you may have kids in the car with you and don't want a social services hassle etc just to make your point.
My fear isn't really state police or sheriff deputies around here since they mostly follow the law or can be sued into lawful compliance. My fear is TSA viper units that are unconstitutional in the first place being allowed to roam the roadways stopping whomever they want. Suing a local (virginia) LEO department for violating your rights can be time consuming and costly but nothing in compared to the federal gubbermant! Since our governor already thinks drones are great for Virginia and I have heard of TSA viper units at truck weigh stations I don't know how long it will be before we all run into something like that. We will need to support (financially) whomever runs into it first and sues so that we can nip it in the bud. That is of course assuming constitutionally literate judges and a judicial process that works.