An Applications Manual for Evaluating Two and Three-Level Diamond Interchange Operations Using TRANSYT-7F

Details

• Creators:
  Messer, Carroll J. ; Malakapalli, Meher P
• Corporate Creators:
  Texas Transportation Institute. Texas A&M University
• Corporate Contributors:
  Texas Department of Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Diamond Interchanges Geometric Design Highway Capacity Level Of Service Mathematical Models Signalized Intersections Stopping Traffic Signal Timing
• Publication/ Report Number:
  FHWA/TX-92/1148-3
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Interim Report, January 1991-December 1991
• Corporate Publisher:
  Texas. Department of Transportation
• Abstract:
  This research report documents an applications manual for evaluating various diamond interchange design alternatives and their traffic operations using TRANSYT-7F. TRANSYT-7F is a macroscopic simulation model developed primarily for optimizing network-wide signal systems to reduce delays, stops, and fuel consumption. The manual could assist the traffic engineer in coding the needed data into TRANSYT-7F for evaluating the performance and the feasibility of future diamond interchange design alternatives in accommodating future traffic growth. Ever increasing traffic demands along urban freeway corridors may entail upgrading an older interchange to a higher capacity interchange. In such a case, the analyst may be interested in determining the preferred design based on an assessment of how various design alternatives would perform with the future traffic. This manual can be effective in evaluating various diamond interchange design alternatives from a traffic operations point of view. It was found that the optimum signal timings produced by TRANSYT-7F performed consistently. The model is especially useful in situations where large queues are expected on the freeway exit ramps. A conclusion can be drawn that TRANSYT-l7F can be used as a desirable evaluating strategy under conditions of substantial queues on the exit ramps of two-level diamond interchanges.
• Format:
  PDF
• Funding:
  Study No. 2-18-88-1148
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0c5c8b2d0feacc3be5b84576344bdcac9e5d40cf1146c5bd013d53fe0ee2fdc7f161aaeeae4407c8faea9530885d87c03816844b4a483cf589d4aa693c71bdd1
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/84774/dot_84774_DS1.pdf
• File Type:
  [PDF - 4.34 MB ]