Auckland Transport spokesman Mark Hannan defended the detection equipment, saying two cameras were used to film passing cars, one pointing forward and the other sideways.
Images were viewed in a professional editing suite where a technician could lighten and expand it, zooming in on frames played at low speeds.
Mr Hannan said Auckland Transport had looked into obtaining thermal imaging cameras, but none that could scan through glass or metal were available to non-military customers.
Another motorist ticketed for using a transit lane, Graham Hughes, said he clearly identified two passengers in his car by using an elderly home PlayStation console to capture still images from a video DVD obtained from Auckland Transport.
He said Auckland Transport did not accept the images, even after he highlighted the face of a rear-seat passenger. Nor would it accept statements from the two passengers, witnessed and stamped by a justice of the peace, that they were in the car when it was filmed in the Onewa Rd T3 lane reserved for vehicles with three or more occupants.
It was only when the Automobile Association interceded that he found out the case had been dropped.