CA 2, Santa Monica Blvd, and Beverly Hills

It's no secret that Beverly Hills tries to reduce the amount of outsiders coming through its city nor is it unnoticed that they make the staggering of their lights unproductive to discourage people from driving through.

However, CA 2 aka Santa Monica Blvd. is not just any street as it, to my understanding, should be under Cal Trans' jurisdiction. If this is the case, then why do the signals on the boulevard decrease traffic flow efficiency (as on other city run streets) in Beverly Hills?

Personally, I'm shocked that nothing has been done about this especially with all of the money that has been spent on that street by taxpayers and Cal Trans.

Thoughts anyone?