00778948

Component

https://doi.org/10.3141/1678-25

http://scholar.google.com...mmer&publication_year=1999

Recent studies have identified the median U-turn (MUT) design as having potential for improving intersection stopped delay at isolated intersections. This study was an effort to quantify the reductions in travel time and other critical traffic operation measures of effectiveness for the MUT and super-street median (SSM) geometric designs over a system of signals compared with the traditional two-way left-turn lane (TWLTL) design. The key function of the MUT design is removal of all left-turn movements at signalized intersections, creating two-phase signal operations and increased progression opportunities. The SSM design allows perfect progression of through traffic in both directions because signals on both sides of the arterial can operate independently. The analysts constructed models of a typical suburban arterial corridor near Detroit, Michigan, in CORSIM according to a fixed external-node coordinate system and fixed origin-destination volumes. These allowed an equitable systemwide comparison of measures of effectiveness between the arterial designs. An analysis of variance determined the importance of arterial geometry related to total system time, average stops per vehicle, and average speed. Results showed that the MUT and SSM designs improved system travel time and average speed compared with the TWLTL design. Analyzing geometry as a function of the time of day showed that the MUT and SSM alternatives significantly reduced system travel time and increased average speeds during the a.m. and p.m. peak hours and showed very similar results compared with the TWLTL design during off-peak conditions. The authors recommend that engineers analyzing alternatives for arterials similar to that tested consider the MUT and SSM designs.

This paper appears in Transportation Research Record No. 1678, Highway Capacity, Quality of Service, and Traffic Flow and Characteristics.

English

p. 208-215

1999

Transportation Research Record

0309071046

Figures (3) ; References (9) ; Tables (5)

Analysis of variance; Arterial highways; Average travel speed; Geometric design; Isolated intersections; Measures of effectiveness; Medians; Microscopic traffic flow; Off peak periods; Peak periods; Traffic delays; Traffic simulation; Travel time; Two way left turn lanes

CORSIM (Traffic simulation model)

Median u-turns

Detroit (Michigan)

Data and Information Technology; Design; Highways; Operations and Traffic Management; Planning and Forecasting; I21: Planning of Transport Infrastructure; I73: Traffic Control

TRIS, TRB, ATRI

Nov 29 1999 12:00AM

• ACCIDENT AND CAPACITY COMPARISONS OF LEADING AND LAGGING LEFT-TURN SIGNAL PHASINGS
• APPLICATION OF SUBSET AUTOREGRESSIVE INTEGRATED MOVING AVERAGE MODEL FOR SHORT-TERM FREEWAY TRAFFIC VOLUME FORECASTING
• ARTERIAL PLANNING METHODOLOGY: CONCEPT, IMPLEMENTATION, AND EXPERIENCE
• BEYOND THE "HIGHWAY CAPACITY MANUAL": FRAMEWORK FOR SELECTING SIMULATION MODELS IN TRAFFIC OPERATIONAL ANALYSES
• CAPACITY OF LIMITED-PRIORITY MERGE
• CAPACITY OF SINGLE-LANE ROUNDABOUTS WITH SLOW TRAFFIC
• CAPACITY STUDY FOR PROTECTED-PERMITTED PHASING FROM SHARED LANES
• CELLULAR AUTOMATA MICROSIMULATION OF BIDIRECTIONAL PEDESTRIAN FLOWS
• COMPARISON OF CAR-FOLLOWING MODELS FOR SIMULATION
• CONGESTED TRAFFIC FLOW: OBSERVATIONS AND THEORY
• ENTERING HEADWAY FOR THROUGH MOVEMENTS AT URBAN SIGNALIZED INTERSECTIONS
• ESTIMATING FREE-FLOW SPEEDS FOR RURAL MULTILANE HIGHWAYS
• FREEWAY AND ARTERIAL TRAFFIC FLOW SIMULATION ANALYTICALLY EMBEDDED IN DYNAMIC ASSIGNMENT
• GAS-KINETIC MODEL FOR MULTILANE HETEROGENEOUS TRAFFIC FLOW
• IMPROVING THE RUNNING TIMES IN "HIGHWAY CAPACITY MANUAL" TABLE 11-4; RELATED OBSERVATIONS ON AVERAGE TRAVEL SPEED
• INVESTIGATION OF SOME CHARACTERISTICS OF CONGESTED FLOW
• INVESTIGATION OF SPEED-FLOW RELATIONSHIP UNDER CONGESTED CONDITIONS ON A FREEWAY
• METHOD FOR ESTIMATING CAPACITY REDUCTION IN HIGH-OCCUPANCY-VEHICLE LANE INGRESS AND EGRESS SECTIONS
• MODELING HETEROGENEOUS TRAFFIC FLOW
• MULTILAYER ARTIFICIAL NEURAL NETWORKS FOR LEVEL-OF-SERVICE ANALYSIS OF SIGNALIZED INTERSECTIONS
• NUMERICAL SIMULATION AND ANALYSIS OF TRAFFIC FLOW
• ON-LINE MONITORING SYSTEM FOR REAL-TIME TRAFFIC MANAGEMENT APPLICATIONS
• PASSING ACTIVITY ON TWO-LANE HIGHWAYS IN SPAIN
• PREPROCESSOR FEATURE EXTRACTOR AND POST PROCESSOR PROBABILISTIC OUTPUT INTERPRETER FOR IMPROVED FREEWAY INCIDENT DETECTION
• PROGRESSION ADJUSTMENT FACTORS FOR UNIFORM DELAY AT SIGNALIZED INTERSECTIONS
• PROPERTIES OF COWAN'S M3 HEADWAY DISTRIBUTION
• QUALITY OF SERVICE FOR INTERRUPTED-FLOW PEDESTRIAN FACILITIES IN "HIGHWAY CAPACITY MANUAL" 2000
• QUALITY OF SERVICE FOR UNINTERRUPTED-FLOW PEDESTRIAN FACILITIES IN "HIGHWAY CAPACITY MANUAL" 2000
• QUEUEING MODEL TO DETERMINE VARIABILITY OF RECURRENT CONGESTION AT FREEWAY LINK OVER A YEAR
• REAL-TIME PREDICTION OF TRAFFIC FLOWS USING DYNAMIC GENERALIZED LINEAR MODELS
• SIMULATION OF LARGE FREEWAY AND ARTERIAL NETWORK WITH CORSIM, INTEGRATION, AND WATSIM
• SOME OBSERVATIONS OF HIGHWAY TRAFFIC IN LONG QUEUES