[JoeB1]

I only worked in CA for 32 years so can only explain a speed trap according to their laws of fruits and nuts.
According to the CA. Vehicle Code section 40802
A "speed trap" is either of the following:
(a) A particular section of a highway measured as to distance and with boundaries marked, designated, or otherwise determined in order that the speed of a vehicle may be calculated by securing the time it takes the vehicle to travel the known distance.

Section 40802(b):
defines where "radar or other electronic devices" can be used to determine speed -- in essence, either on "local streets and roads" or on highways where a traffic survey has been conducted within the last five years.

So unless the officers are using a known length of roadway that they have actually marked off and are willing to state that in court, they are not using a "speed trap". Lots of people consider a location repeatedly used for speed enforcement a speed trap. Cops refer to them as duck ponds and judges refer to them as complain generators. Speeders refer to them as "not again, lord", locations.
Speed surveys are used to determine speed limits based on the numbers of vehicles that pass a given location at the median and average speeds for specific given times and days of the week. Traffic engineers take weeks to analysis the speed given the sight distance, number of vehicles, width of the road, shoulder size, configuration, angle of the sun, street lights at night, and a few others I can't remember.
Bottom lines is, like I saw in Alaska "Pick your speed --$50 dollars for anything over 45 MPH...$25 dollars for every 10 MPH over that".
The spot to stop in CAli is Star Bucks, not Dunkkin Donuts, way nicer veiws in SB's