The measurement uncertainty of video distance measuring techniques VAM and VAMA in the official monitoring of traffic
In order to measure the speed of, and the distance between, vehicles video measuring techniques are mainly used in the official monitoring of traffic in Germany. Courts have asked for expert reports on the most frequently applied techniques: video distance measuring technique (VAM) and video distance measuring installation (VAMA). The measurement uncertainty of the video stop-watch was analysed as was also the possible disadvantages for persons affected. In order to prove speeding, the degree of deviation and the digitalisation margin of error (0.1 s) have to be considered in choosing the two video half-pictures. Also, the measurement of distance should be based on video half-pictures selected in accordance with the VAMA rules of operation. As a result of the reports, the traffic limits for the video stop-watch have been changed in the second additional clause of the construction licensing, and the degree of deviation has been decreased to 0.1%.
Bibliographic Reference: Report: PTB-MA-57 DE (1997) 35pp.
Availability: Available from Physikalisch Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (DE)
ISBN: ISBN 3-89701-078-X
Record Number: 199810652 / Last updated on: 1998-06-08
Original language: de
Available languages: de