The report gives guidance to staff engaged in maintaining Fischer and Porter recording traffic counters at the 50- point census and other sites. The counters provide flow information every 15 minutes on the form of coded punched holes on a paper tape which can be mechanically proceeded for analysis by computer. Vehicles are sensed by a pneumatic detector stretched across the road at right-angles to the path of the traffic. A routine maintenance visit to the site at least once a week is recommended and a procedure for checking the performance of the installation is given. The operation of the counter and ways of detecting and remedying the more common faults are described. Detailed instructions are included for installing the detector tube and setting up the counter at the start of an automatic count.
Samenvatting