AN EXPERIMENT WITH EVERGREEN TREES IN EXPRESSWAY MEDIANS TO IMPROVE ROADWAY DELINEATION

SIMULATED MEDIAN PLANTINGS WERE INSTALLED ON SELECTED PORTIONS OF TWO CHICAGO EXPRESSWAYS TO DETERMINE WHETHER SUCH A MEANS OF PROVIDING ROADWAY DELINEATION WOULD SIGNFICANTLY REDUCE THE FREQUENCY OF VEHICLE ENROACHMENT ON THE MEDIAN. A COMPLETE RECORD OF ENCROACHMENTS WAS OBTAINED DURING THE WINTER FOR COMPARISON WITH THE NUMBER OF ENCROACHMENTS THAT OCCURRED DURING THE SAME PORTION OF THE PREVIOUS YEAR. THERE WAS A SIGNIFICANT REDUCTION IN THE FREQUENCY OF ENCROACHMENT ON THE MEDIANS OF BOTH EXPRESSWAYS, WITH THE GREATEST REDUCTIONS OCCURRING ON OR NEAR CURVED ALIGNMENT WHERE THE HAZARD OF HEADLIGHT GLARE FROM OPPOSING VEHICLES HAD PREVIOUSLY BEEN GREATEST. HOWEVER, NO ATTEMPT WAS MADE TO MEASURE THE RELATIVE MAGNITUDE OF THE SEVERAL ROADWAY DELINEATION BENEFITS THAT WERE ASSUMED TO HAVE CONTRIBUTED TO THE OBSERVED REDUCTIONS. THE FINDINGS SUGGEST THE POSSIBILITY OF SUBSTANTIAL IMPROVEMENT IN THE SAFETY OF DIVIDED HIGHWAYS THROUGH THE DEVELOPMENT AND USE OF MEDIAN PLANTINGS APPROPRIATE TO THE NEEDS OF THE DRIVER UNDER THE VARIOUS CONDITIONS IMPOSED BY ROADWAY CHARACTERISTICS, DRIVING CONDITIONS, AND SURROUNDING LAND USE. /AUTHOR/

  • Supplemental Notes:
    • Ihr-59, No. 30, NOV64
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Urbana, IL  USA  61801
  • Authors:
    • HUTCHINSON, J W
    • Lacis, J H
  • Publication Date: 1964-11

Subject/Index Terms

Filing Info

  • Accession Number: 00204590
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Sep 1 1994 12:00AM