Nah, cops being on the highway is one of the big causes of traffic. Everyone slows down to the speed limit when they come up on a cop and many are too timid to pass at all. This causes a huge brake wave and fucks everything up. It's why I don't think speed limits should even be a thing or should at least be adjusted because most highways are so low that just about everyone ignores them (and is not harmed doing so) until law enforcement appears. If people want to go slower that's fine but they need to keep right when they aren't passing and everyone needs to leave plenty of space in front of them so that traffic is permeable enough that people can get to their exit without causing brake waves and absorb the "shock" when it is necessary for someone to hit their brakes.

The problem with that is people would still do the same stupid shit behind the pace cars which would just cause the same issues.

The only way traffic pace cars would work is with better fundamental training (and enforcement of that training [meaning cops would actually have to regularly ticket people for tailgating]).

Especially here in the usa there are hardly any barriers to getting/keeping your license.

There is a massive amount of drivers who either shouldn't be on the road at all or with heavy restrictions like not allowed to drive at night, not allowed on the highway, not allowed to drive certain classes of cars (kinda like other countries do for motorcycles because there is zero reason for any joe schmoe to just be able to legally get behind the wheel of something like a supercar on public roads)

This is about 2 decades old now but a bunch of people tried something sorta like a pacing car https://www.youtube.com/watch?v=OoETMCosULQ

Or we could just build trains and other alternatives to cars, which would end up cheaper, faster, safer, environmentally friendly, ...but we have big oil.

(Sry, I had to)

I feel like regular patrol cars might work like this already - who's going to blow past a cop driving down the road?