SINGING MEDIAN GUIDES CARS

ABOUT SIX YEARS AGO, THE ONTARIO HIGHWAY DEPARTMENT BEGAN INVESTIGATING A NEW TYPE OF HIGHWAY MEDIAN STRIP KNOWN AS THE SINGING MEDIAN TO FIND A DIVIDER THAT WOULD BE MORE EFFECTIVE THAN A PAINTED WHITE LINE BUT NOT AS EXPENSIVE AS A STRUCTURAL BARRIER. AFTER A NUMBER OF EXPERIMENTS, A STRIP OF CORRUGATED CONCRETE SURFACE, ABOUT 4 FT WIDE WITH 4 1/2 IN. SPACING OF CORRUGATION AND A DEPTH OF 1/2 IN. WAS DESIGNED. THE EXPERIMENTS, MORE ACOUSTICAL THAN STRUCTURAL, WERE AN ATTEMPT TO DEVELOP A SATISFACTORY SOUND WHEN A CAR DROVE OVER THE MEDIAN. THE FINAL DESIGN PRODUCES A NOISE DESCRIBED AS A RESONANT HUM, LIKE THE NOTE PRODUCED WITH THE FOOT PEDALS OF A CHURCH ORGAN. THE TONE RISES WITH THE SPEED OF THE VEHICLE+ A SLOW CAR CAUSES A BASE GRUMBLE AND A FAST CAR PRODUCES A HIGH WHINE. EARLY TESTS SHOWED THAT A CONTINUOUS STRIP OF CORRUGATION MIGHT APPEAR TO A MOTORIST TO BE MERELY A CHANGED OR ROUGHER STRETCH OF PAVEMENT. THE SOLUTION WAS TO ALTERNATE BANDS OF 6-FT SMOOTH SURFACES AND 4-FT RIPPLED SURFACES, PRODUCING AN UNMISTAKABLE PATTERN THAT A MOTORIST COULD NOT HELP NOTICING. /CGRA/

  • Supplemental Notes:
    • Vol 78, No 1, PP 56-57, 1 FIG, 4 PHOT
  • Authors:
    • Fulford, P E
  • Publication Date: 1965-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00203208
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 18 1994 12:00AM