"Confidence in the accuracy of VPC data is critical to their widespread use and acceptance within and outside the transit agency." says the Transit Cooperative Research Program
With CCTV counting operators can simply watch the video back - which shows both people getting on and off the vehicle together with the increasing counts - and thus verify that the system is counting properly. Transit agencies can have complete confidence in the passenger data they are receiving. The passenger count data is saved as text, CSV (comma separated variable such as suitable for input to Excel) or in MySql format to be easily integrated into existing database systems.