A SEGMENTED ELECTRICAL ELEMENT FOR DETECTING VEHICULAR TRAFFIC

BESIDES SENSITIVITY TO TRANSVERSE PLACEMENT, OTHER IMPORTANT DESIGN CRITERIA INCLUDE INEXPENSIVE MANUFACTURE, INEXPENSIVE INSTALLATION AND MAINTENANCE, PORTABILITY, RUGGED CONSTRUCTION FOR FIELD USE, RELIABILITY OF OPERATION, CONCEALMENT FROM THE DRIVER, AND WEATHER RESISTANT QUALITIES. THE DETECTOR IS OF THE SO-CALLED METALLIC CONTACT TYPE IN WHICH TWO METALLIC ELEMENTS, NORMALLY HELD OPEN BY SOME FORM OF A SPACER, ARE CLOSED BY A WHEEL PASSING OVER THEM. IN THIS DESIGN, THE BOTTOM CONTACT EXTENDS THROUGHOUT THE ENTIRE LENGTH OF THE UNIT AND SERVES AS A COMMON CONTACT FOR ALL THE CIRCUITS. THE TOP CONTACT IS MADE UP OF ONE-FOOT METAL SEGMENTS WHICH, TOGETHER WITH THE COMMON BOTTOM CONTACT, CONSTITUTE THE ELEMENTS FOR THE INDIVIDUAL CIRCUITS. LEAD WIRES ARE ATTACHED TO EACH SEGMENT SO THAT, WITH APPROPRIATE JUMPER CONNECTIONS, ANY DESIRED SEGMENT WIDTH CAN BE READILY OBTAINED. THE ENTIRE UNIT IS ATTACHED TO THE ROAD SURFACE BY MEANS OF A QUICK DRYING RUBBER CEMENT AND A COVERING OF INDUSTRIAL ADHESIVE TAPE. THE TAPE ALSO SERVES TO PROTECT THE UNIT FROM ABRASIVE TIRE ACTION. IN ORDER TO EVALUATE THE DESIGN A TEST PROGRAM WAS SET UP WHEREIN THE DETECTING UNIT WOULD BE SUBJECTED TO BOTH SEVERE AND ORDINARY DRIVING CONDITIONS AS WELL AS TO A SERIES OF CONTROLLED CONDITIONS INVOLVING RAPID ACCELERATION, DECELERATION AND SKIDDING. /AUTHOR/

  • Supplemental Notes:
    • Vol 29, pp 374-383, 2 FIG, 7 PHOT, 7 REF
  • Authors:
    • MATHEWSON, J H
    • Brenner, R
    • Reiss, R J
  • Publication Date: 1950

Media Info

  • Monograph Title: Proceedings of the Twenty-Ninth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 13-16, 1949.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00228082
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 25 1971 12:00AM