If they had only issued 100 tickets, we could debate Constitutional allowance. But it was 1,834 tickets issued. Now it could be that people weren't carrying proof of insurance. They had it but they weren't carrying it. If you have ever been in an accident that wasn't your fault, you know the importance of the other guy having insurance. If he doesn't have a license or insurance, you are majorly screwed through no fault of your own. Your liberties are about to be trampled. You are going to the prom with your insurance company and YOU are going to be the one wearing your ankles for earrings.
In theory, it could be a violation of rights. In reality, you have to drive on the same roads as these people. Just remember: 1,834 tickets issued
The tickets were mostly for not having "proof" of insurance, i.e. an insurance card. There are no statistics given on how many of those ticketed people had no insurance. This type of of roadblock is just another example of anarcho-tyranny. It is far easier and safer for cops to stop and ask law-abiding people for their papers than it is to solve crime and confront criminals.