A METHODOLOGY FOR COMPUTATION OF THE ENVIRONMENTAL CAPACITY OF ROADWAY NETWORKS

IN EVALUATING ALTERNATIVE TRANSPORTATION SYSTEMS FOR THE URBAN CORRIDOR DEMONSTRATION PROGRAM IN LOUISVILLE, KENTUCKY, IT BECAME NECESSARY TO DEVELOP A PROCEDURE THAT WOULD DIRECTLY CORRELATE THE TRANSPORTATION SYSTEM WITH THE ENVIRONMENT THROUGH WHICH IT PASSES. THIS METHODOLOGY WAS NECESSARY BECAUSE ROADWAY AND TRANSIT IMPROVEMENTS COULD ONLY BE MADE TO SURFACE STREETS; NO FREEWAY FACILITY DIRECTLY SERVES THIS AREA. CHANGES IN TRAFFIC ON SURFACE STREETS DIRECTLY AFFECT THE ENVIRONMENT OF THOSE PEOPLE LIVING, WORKING, OR SHOPPING ADJACENT TO THE FACILITY. THESE ENVIRONMENTAL EFFECTS MUST BE QUANTIFIED IN ORDER TO PROPERLY EVALUATE THE TRANSPORTATION IMPROVEMENTS. A METHODOLOGY WAS DEVELOPED WHEREBY STREET SEGMENTS WERE STRATIFIED BASED ON ROADWAY AND LAND USE CHARACTERISTICS. PEOPLE RESIDING, WORKING, OR SHOPPING ADJACENT TO THESE STREET "PROTOTYPES" WERE QUESTIONED IN SUCH A WAY AS TO DEVELOP AN ANNOYANCE INDEX FOR EACH PROTOTYPE. THIS ANNOYANCE INDEX RELATED PEOPLE'S PERCEPTIONS OF NOISE, AIR POLLUTION, AND SAFETY TO THE LEVEL OF TRAFFIC ON THE STREET. THROUGH PREVIOUS QUESTIONNAIRES THE ENVIRONMENTAL CRITERIA OF NOISE, AIR POLLUTION, AND SAFETY WERE FOUND TO BE MOST SIGNIFICANT WHEN RELATED TO TRAFFIC. SIMILAR STREET PROTOTYPES WITH VARIOUS LEVELS OF TRAFFIC WERE STUDIED, AND RELATIONSHIPS BETWEEN ANNOYANCE AND TRAFFIC VOLUME WERE THEN DEVELOPED FOR EACH PROTOTYPE. FROM THESE RELATIONSHIPS, AN "ENVIRONMENTAL CAPACITY" EXPRESSED IN VEHICLES PER DAY WAS ESTABLISHED FOR EACH ROADWAY SEGMENT IN THE STUDY AREA. THESE RESULTS WERE USED TO EVALUATE THE EFFECT ON THE ENVIRONMENT OF VARIOUS TRANSPORTATION IMPROVEMENTS CONSIDERED. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 33-40
  • Monograph Title: Transportation systems planning process
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00200554
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Feb 23 1973 12:00AM