FOG DETECTORS FOR CONTROLLING CHANGEABLE-MESSAGE SIGNS

THREE INSTRUMENTS THAT WILL CONTINUOUSLY AND AUTOMATICALLY MEASURE VISIBILITY, DETECT FOG, OR DO BOTH ARE THE FORWARD- SCATTER FUMOSENS, THE BACK-SCATTER VIDEOGRAPH, AND THE TRANSMISSOMETER SKOPOGRAPH, THESE INSTRUMENTS ARE MANUFACTURED BY IMPULSPHYSIK, GMBH, HAMBURG, WEST GERMANY AND HAVE RECENTLY BEEN INTRODUCED INTO THE U.S.A. TABLE COMPARES THE CHARACTERISTICS - VISIBILITY RANGE, OUTPUT SIGNAL, POWER, OPERATING TEMPERATURE, OPERATING HUMIDITY, WEIGHT, BASE, AND CALIBRATION--FOR EACH INSTRUMENT.

• Record URL:
  • https://onlinepubs.trb.org/Onlinepubs/sr/sr129/129-005.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309020530
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Corporate Authors:

  Highway Research Board

  2101 Constitution Avenue, NW
  Washington, DC    20418
• Authors:
  • Spear, Edward D
• Conference:
  • Conference on the Changeable-Message Concept of Traffic Control
  • Date: 1971-7-15 to 1971-7-16
• Publication Date: 1972

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: p. 20-23
• Monograph Title: THE CHANGEABLE-MESSAGE CONCEPT OF TRAFFIC CONTROL
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 129
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Automatic control; Detectors; Fog; Variable message signs; Visibility
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00226389
• Record Type: Publication
• ISBN: 0309020530
• Files: TRIS, TRB
• Created Date: Feb 3 1973 12:00AM