I read a couple of sources that mention five minute idling laws for both CA and Sacramento. Is that what you’referring to?
22515. (a) No person driving, or in control of, or in charge of, a motor vehicle shall permit it to stand on any highway unattended without first effectively setting the brakes thereon and stopping the motor thereof.
SETTING BRAKE? On a hill, I have heard of this, but on any street? I did see that street is the same as highway, but not private property.