A modest proposal.

If the local constabulary wants to deal with the injunction-violating big rig jackasses on the Hill who insist on blowing their air horns, let me make a simple suggestion. Whenever one of those yobs is identified, a cop takes the crowbar he is carrying, climbs to the roof of the rig, and physically removes the horns. And it's not like there's any danger to the cop, since the truckers have packed themselves in so tightly that there's little chance of that rig going anywhere while horn removal is being effected.

This seems like a trivial solution -- if a trucker wants to blow his horn, you simply make sure that it's the very last time that happens.

You're welcome.