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Re:When McDonalds Came to Denmark by gumby on Tuesday September 21, 2021 @06:53PM (#28611039)
The links in that page describe the process, including the part you referred to "overriding" the speed limit. I don't think they use that term, but look for what the code calls out for "speed traps".

Here's a concrete example: Embarcadero road in Palo Alto feeds from highway 101. It has a posted speed limit of 25, and there is a perennial complaint presented to the city council, letters to the editor etc: why won't the police come out and enforce the speed limit? The answer is that to do so they'd have to do a survey and then adjust the limit...up (I think traffic travels about 40-45 MPH on this road). If that is the reasonable and proper rate for that road, to enforce anything lower would be a speed trap. The city keeps the 25 signs up in the hope that they discourage even faster driving.

Likewise when they use radar they not only have to post a sign but do a survey, which has to be updated every few years -- you can't use radar to enforce something unfair. I'm not sure the radar signs on Embarcadero are even current (thus probably not even legal).

BTW as I learned in driving school years ago (got a ticket), apart from "reasonable and proper at all time" you can't go over 55 anywhere unless it's explicitly posted. Actually I got all this initially from driving school, and then when Jim Warren went to the effort of getting the entire CA legal code online in the 90s, I actually read a good chunk of the vehicle code in particular.

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