THE INFLUENCE OF AN EXPRESSWAY ON TRAVEL PARAMETERS- THE DAN RYAN STUDY

BEFORE AND AFTER STUDIES WERE CONDUCTED ON THE INFLUENCE OF THE DAN RYAN EXPRESSWAYS ON THE TRAFFIC NETWORK OF THE AREA BY CATS. THE BEFORE STUDY CONSISTED OF BOTH ROADSIDE INTERVIEWING AND HANDING OUT POST CARDS TO NORTHBOUND MOTORISTS ON ARTERIAL AND LOCAL STREETS INTERSECTION AT 63RD STREET IN THE MORNING HOURS. THE AFTER SURVEY CONSISTED OF INTERVIEWING AND HANDING OUT POST CARDS AT THE SAME STATIONS AND ALSO HANDING OUT POST CARDS ON ALL NORTHBOUND RAMPS. ADDITIONAL STUDIES CONSISTED OF A COMPLETE BEFORE AND AFTER TRAFFIC SAMPLING PROGRAM ON ALL AUTOMOBILE FACILITIES /LOCAL ARTERIAL, AND EXPRESSWAY/ IN THE STUDY AREA. THE SIGNIFICANT FIND OF THE VOLUME ANALYSIS WAS THAT WITH THE ADDITION OF VEHICLE CAPACITY IN AN AREA, TRAFFIC WILL REDISTRIBUTE IT- SELF BY UPGRADING, I.E., DIVERSION WILL OCCUR FROM A LOCAL NETWORK TO AN ARTERIAL NETWORK AND FROM AN ARTERIAL NETWORK TO AN EXPRESSWAY NETWORK IN A PREDICTABLE MANNER. THIS DIVERSION FROM LOWER GRADE NETWORKS TO HIGHER ONES IS DESIRABLE IN TERMS OF SAFETY, VEHICLE OPERATING COSTS, ETC. ACCIDENTS INCREASED AT A LESSER RATE IN THE STUDY AREA THAN FOR THE ENTIRE CITY. FATAL ACCIDENTS ACTUALLY DECREASED IN THE STUDY AREA WHILE THE CITY-WIDE TOTAL INCREASED IN THE AFTER STUDY.

  • Supplemental Notes:
    • 46pp, 19fig, 18TAB
  • Corporate Authors:

    Chicago Area Transportation Study

    300 West Adams Street
    Chicago, IL  United States  60606
  • Authors:
    • Hinkle, J J
    • Frye, F F
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00227598
  • Record Type: Publication
  • Source Agency: Urban Transp Plng Abstracts /Prelim
  • Files: TRIS
  • Created Date: Aug 15 2004 2:02AM