Near my downtown side-streets there are temporary barriers that you can actually drive around (but you know you're going against what the sign says).
I presume enforcement is always an option.
Another point, on my street there used to be horrible backup right in front of my house, but once the light near the school nearby went to a half-duplex mode, apps stopped recommending it as a sure bet shortcut. Once that happened traffic lowered considerably.
Waze and Google Maps tend to have bad/outdated data and tell people to make illegal turns. The roads near my apartment changed over a year ago and I still see people make illegal left turns (including Lyft drivers unless I warn them about it in advance).
I presume enforcement is always an option.
Another point, on my street there used to be horrible backup right in front of my house, but once the light near the school nearby went to a half-duplex mode, apps stopped recommending it as a sure bet shortcut. Once that happened traffic lowered considerably.