Complicated solution to a simple problem

[Gone in 60]

Well, any car that uses these lanes carrying fewer than three people has to pay for using them. They're just not charging motorcycles.
When these were unpatrolled car pool lanes, it was under an honor system that only cars with more than one person could use them. They were heavily used, since honor is rare. Now that you are billed for using them, they have more tumbleweed traffic than cars.