Q'S AND Q'S
IF A HIGHWAY SYSTEM IS TO BE USED FOR BOTH PUBLIC (BUSES) AND PRIVATE (CARS) TRANSPORTATION, IT IS OFTEN ADVANTAGEOUS TO GIVE SOME TYPE OF PRIORITY SERVICE TO BUSES. SINCE SEVERE CONGESTION IS USUALLY CONFINED TO ONLY A FEW CRITICAL SECTIONS OF A HIGHWAY OR TO SOME CRITICAL BOTTLENECKS, A PRIORITY SCHEME FOR SERVICE OF THESE BOTTLENECKS COULD HAVE A SIGNIFICANT EFFECT UPON THE TOTAL PASSENGER DELAY IN THE ENTIRE HIGHWAY SYSTEM. TWO RELATED TYPES OF STRATEGIES ARE CONSIDERED. FIRST, SUPPOSE THAT ON A FINITE SECTION OF A MULTILANE EXPRESSWAY THERE IS A TOTAL FLOW Q AND NO QUEUE Q AT THE ENTRANCE OR EXIT. IF BUSES ARE GIVEN ONE OR MORE LANES FOR EXCLUSIVE USE, IT IS POSSIBLE TO ACHIEVE A HIGHER VELOCITY FOR BUSES BUT A LOWER VELOCITY FOR CARS THAN WOULD EXIST UNDER MIXED OPERATION AT THE SAME TOTAL FLOW. THE HIGHER VELOCITY FOR BUSES, EACH CARRYING MANY PASSENGERS, WILL IN MANY CASES OFF-SET THE INCREASED DELAY TO CAR PASSENGERS. SECONDLY, IF A QUEUE DOES EXIST AT A BOTTLENECK THEN THERE ARE VARIOUS QUEUE DISCIPLINES WHICH MIGHT BE APPLIED TO KEEP THE QUEUE OF BUSES AS LOW AS POSSIBLE, AT THE EXPENSE OF THE CARS. STRATEGIES OF FIRST-COME-FIRST- SERVED, PRIORITY SERVICE, AND SEPARATE SERVICE FOR BUSES ARE COMPARED UNDER THE CONDITION OF A HEAVY RUSH-HOUR DEMAND. /AUTHOR/
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Supplemental Notes:
- Vol 15, SupPLEMENT 3, P B-221
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Authors:
- May, A G
- Newell, G F
- Oliver, R M
- Potts, R B
- Publication Date: 1967
Media Info
Subject/Index Terms
- TRT Terms: Bottlenecks; Bus lanes; Bus transportation; Highways; Peak hour traffic; Peak periods; Private transportation; Strategic planning
- Subject Areas: Highways; Motor Carriers; Operations and Traffic Management; Public Transportation;
Filing Info
- Accession Number: 00225164
- Record Type: Publication
- Files: TRIS
- Created Date: Jan 16 1994 12:00AM