Where in the Constitution it is not ok for them to do this? After all, you are on public roads, you still can go anywhere you want. I don't see where they are violating the Constitution here.
Remember, the Constitution doesn't grant YOU rights, those are natural. The Constitution is there to GRANT the federal govt very limited, enumerated rights. Basically it is supposed to be there to grant them rights and responsibilities, and anything NOT in the constitution is not something they are supposed to be able to do. This was the foundation for a limited, and minimally intrusive form of Federal Govt., which has been bastardized over the years, and many of us would prefer to have reigned in.
The govt is not supposed to be there to track me, nor put out a blanket dragnet of surveillance to try to find any wrongdoers out there. Especially at the Federal level. Possibly more able to at the state level, but at least on state and local level, you have a bit more recourse and influence over the local politicians than at a federal level.
Not to mention, if you don't like the rules of one state you are free to move to a more like minded state. If this is done federally and nationally, you lose that freedom.
But yes, the Constitution is there to grant very LIMITED and enumerated rights, roles and responsibilities for the federal govt. If it isn't in it the constitution, it should not be a power they have.
At least, that's the way and thought behind the construction and mandate of our govt. in the beginning.