Have Toll conscessionaires got the BEST toll system?

Thank you for your report on "Toll Tales" No chance for toll collectors to pocket change and I was struck by the comment of one of the concessionaires, responding to a question by your reporter, I quote, "..However, one big question remains — the treadle would not be able to differentiate taxis and private cars as both have four tyres and two axles. Litrak admitted that it was the only setback but the company was aware of the pattern, as in the number of taxis using the highway, thus it was capable of spotting any unusual collections..."

This is surely NOT a satisfactory situation to be in, and I feel the concessionaire, has not properly evaluated or installed a system with proper controls, to completely eliminate this weakness. I understand that there are concessionaires who have eliminated this menace, by installing CCTVs on each lane, which takes as snap shot (frame grab) of the vehicle each time a Class 4 or taxi is indicated. At the end of shift, these 'frame grabs' are viewed by the supervisor, and if for example, a "non taxi" is classified as a taxi, appropriate action will be taken against the toll collector. Such a system will remove any doubt, and enhance the security of the Toll collections..I wonder if this concessionaire has considered this option, instead of relying on "traffic patterns" to do his job