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Some number plate recognition systems can also be used from vehicles.One issue is the potential conflict of interest when private contractors are paid a commission based on the number of tickets they are able to issue.In the latter case, depending on the direction of travel, the target vehicle's relative speed is either added or subtracted from the enforcement vehicle's own speed to obtain its actual speed.The speedometer of the camera vehicle needs to be accurately calibrated.These cameras time vehicles over a known fixed distance, and then calculate the vehicle's average speed for the journey.In 2007, the Mountains Recreation and Conservation Authority (MRCA), in California, installed the first stop sign cameras in the United States.Some groups, such as the National Motorists Association in the USA, claim that systems "encourage ...
If the camera is fixed to the vehicle, the enforcement vehicle does not necessarily have to be stationary, and can be moved either with or against the flow of traffic.
In California, that need to identify the actual violator has led to the creation of a unique investigatory tool, the fake "ticket".
In Arizona and Virginia, tickets issued by cameras are unenforceable due to there being no penalty for ignoring them.
Cameras can be concealed, for example in garbage bins.
Mobile speed cameras may be hand-held, tripod mounted, or vehicle-mounted.