If an officer uses traffic radar or LIDAR (laser) to measure speed for enforcement purposes, he usually has to be prepared to testify in court to the type of device used, its serial number, and the date of its last calibration. This information isn't necessarily recorded on the violator's copy of the citation. Officers usually make notes on each citation issued. The notes may be in the officer's personal notebook, or on a copy of the citation sent to the court.
For a speeding ticket issued by a Police Officer, Yes! For an alleged speed camera violation, No!
There are no such laws. A police officer can check your speed anywhere along the roadway. If you're in excess of the posted speed for that stretch of road, and they pull you over, it's a ticket.
In CA, the defintion of a speed trap is when the posted signs indicate a speed lower than what an engineering traffic survey (ETS) found to be the safe speed AND an officer then writes a ticket based on that low speed.
Instantaneous, usually. When the officer uses a radar or laser gun to "clock" you, he is determining your instantaneous speed. But sometimes police use helicopters to track the time it takes you to travel between two landmarks. In those cases, it's your average speed that's being recorded.
In CA, the defintion of a speed trap is when the posted signs indicate a speed lower than what an engineering traffic survey (ETS) found to be the safe speed AND an officer then writes a ticket based on that low speed.
It depends on the particular officer. You may be arrested, or the officer may just write you a ticket. In many localities, a ticket for 20 MPH or more over the speed limit requires you to appear in court.
The police car itself will never give you a speeding ticket. The officer inside the car, however, can, whether or not their vehicle is in motion. They are just as capable of taking speed measurements while movement as they are while stationary.
speed and distance
The amount of the ticket will depend upon how much you are going over the speed limit. It will also depend upon if you get stopped by a city or county police officer.
Yes. The defintion of a speed trap is when the posted signs indicate a speed lower than what an engineering traffic survey (ETS) found to be the safe speed AND an officer then writes a ticket based on that low speed. See Section 40802 of the CA vehicle code.
a crime
If the speed was not locked in and the officer refused to show you the radar, take the ticket to court. Odds are in your favor that the judge will dismiss your ticket. That answer is incorrect. In no state is there a requirement that the officer show you the radar or even that he lock it in. The officer's testimony is sufficient for a conviction. In fact, in most states all an officer has to testify is that he visually observed you speeding and that is sufficient.