STUDY OF FREEWAY ACCESS VIOLATIONS

DETERMINATION WAS MADE OF THE EXTENT AND CAUSES OF ACCESS VIOLATIONS ON CONTROLLED ACCESS FACILITIES TO PROVIDE DATA THAT WOULD BE USEFUL IN CONTROLLING EXISTING ACCESS VIOLATIONS AND IN ANTICIPATING AND ELIMINATING FUTURE VIOLATIONS. THE SPECIFIC OBJECTIVES OF THE STUDY WERE' /1/ TO CATALOG THE TYPES OF ACCESS VIOLATIONS ON CONTROLLED ACCESS FACILITIES, /2/ TO DETERMINE THE EXTENT AND CAUSES OF ACCESS VIOLATIONS, AND /3/ TO DETERMINE THE EFFECTIVENESS OF VARIOUS DESIGN AND CONTROL FEATURES PRESENTLY BEING UTILIZED TO PREVENT ACCESS VIOLATIONS. DATA WERE COLLECTED ON A ONE- TIME BASIS ON APPROXIMATELY 770 MI OF FREEWAY WHICH INCLUDED ALL INTERSTATE HIGHWAYS WITHIN TEXAS. CONCLUSIONS BASED ON THE STUDY PERFORMED WERE' /1/ A TOTAL OF 28 SEPARATE TYPES OF VIOLATIONS WERE OBSERVED AND DEFINED, /2/ A RATION OF 1.3 ACCESS VIOLATION LOCATIONS PER MILE OF FREEWAY WERE DETERMINED AND A RATIO OF 1.9 ACCESS VIOLATION LOCATIONS PER MILE OF URBAN FREEWAY, AND /3/ FIVE TYPES OF ACCESS VIOLATIONS ACCOUNTED FOR 63.5 PERCENT OF THE 986 OBSERVED ACCESS VIOLATION LOCATIONS. THE MOST PREVALENT TYPES WERE SEPARATION STRIP CROSSING, EXIT WHERE NO EXIT RAMP EXISTS, MEDIAN CROSSING, SEPARATION STRIP CROSSING, ENTRANCE, WHERE NO ENTRANCE RAMP EXISTS, UNATTENDED VEHICLE ON SHOULDER, AND CROSSING ENTIRE FREEWAY SYSTEM. THE EXTENT AND SEVERITY OF ACCESS VIOLATIONS SUGGEST ADDITIONAL STUDIES TO DETERMINE DEISGN CHANGES IN FREEWAY FACILITIES WHICH WILL COINCIDE MORE CLOSELY WITH DRIVERS DESIRES AND THE DETERMINATION OF CONTROL MEASURES TO ELIMINATE VIOLATIONS NOW EXISTING ON FREEWAY FACILITIES.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1967/152/152-003.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Operational Effects of Geometrics and presented at the 45th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Tipton, William E
  • DREW, DONALD R
  • Spencer Jr, Roger Q
• Publication Date: 1967

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 66-102
• Monograph Title: Geometric design, barrier rails and sign supports
• Serial:
  • Highway Research Record
  • Issue Number: 152
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Access; Control devices; Data collection; Freeways; Geometric design; Medians; Railroad grade crossings; Separators
• Uncontrolled Terms: Violations
• Geographic Terms: Texas
• Subject Areas: Design; Highways; Operations and Traffic Management; Railroads;

Filing Info

• Accession Number: 00225125
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Mar 20 1994 12:00AM