00756144

Component

https://doi.org/10.3141/1635-14

http://scholar.google.com...ixon&publication_year=1998

A conflict study evaluated double left-turn lanes with protected-plus-permitted signal phasing. The data collection team observed traffic behavior at four intersections in the metro Atlanta region. Included in the data set are three intersections operating under protected-plus-permitted signal phasing and a fourth intersection with a before and after examination of a protected-plus-permitted signal phase changed to protected-only phasing. The authors calculated the traffic rates for five conflict types and one traffic event unique to double left-turn movements. A statistically significant decrease in traffic conflicts was identified for the before and after comparison site. The study also identifies unique intersection geometry and traffic volumes at each site and compares traffic conflicts associated with the features. The results generally show that the enhanced capacity of double left-turn lane intersections operating under protected-plus-permitted signal phasing may occur at the expense of the safety of the traveling public.

This paper appears in Transportation Research Record No. 1635, Safety Analysis Related to Highway Design, Crash Costs, and Traffic Records Systems; Methodologies for Evaluating Safety Improvements.

English

p. 105-112

1998

Transportation Research Record

0309065070

Figures (6) ; References (7) ; Tables (2)

Exclusive permissive phasing; Field studies; Geometry; Highway capacity; Left turn lanes; Signalized intersections; Traffic conflicts; Traffic safety; Traffic volume

Atlanta (Georgia)

Atlanta (Georgia)

Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control; I81: Accident Statistics

TRIS, TRB, ATRI

Nov 10 1998 12:00AM

• ACCIDENT MODELS FOR TWO-LANE RURAL SEGMENTS AND INTERSECTIONS
• ALLOCATING THE COSTS OF MOTOR VEHICLE CRASHES BETWEEN VEHICLE TYPES
• APPLYING THE ORDERED PROBIT MODEL TO INJURY SEVERITY IN TRUCK-PASSENGER CAR REAR-END COLLISIONS
• CONSIDERATION OF BOLLARD TREATMENT AT EXIT GORE AREAS
• DEVELOPMENT OF EXPECTED CONFLICT VALUE TABLES FOR UNSIGNALIZED THREE-LEGGED INTERSECTIONS
• DEVELOPMENT OF SAFETY-BASED LEVEL-OF-SERVICE PARAMETERS FOR TWO-WAY STOP-CONTROLLED INTERSECTIONS
• DISAGGREGATE SAFETY PERFORMANCE MODELS FOR SIGNALIZED INTERSECTIONS ON ONTARIO PROVINCIAL ROADS
• EFFECT OF ENVIRONMENTAL FACTORS ON DRIVER SPEED: A CASE STUDY
• EFFECTS OF A TOWAWAY REPORTING THRESHOLD ON CRASH ANALYSIS RESULTS
• EVALUATING MEDIAN CROSSOVER LIKELIHOODS WITH CLUSTERED ACCIDENT COUNTS: AN EMPIRICAL INQUIRY USING THE RANDOM EFFECTS NEGATIVE BINOMIAL MODEL
• EXPLORATORY MULTIVARIABLE ANALYSES OF CALIFORNIA DRIVER RECORD ACCIDENT RATES
• INVESTIGATION OF NATIONAL HIGHWAY SYSTEM ROADWAYS IN THE HIGHWAY SAFETY INFORMATION SYSTEM STATES
• INVESTIGATION OF THE EFFECTIVENESS OF BOULEVARD ROADWAYS
• POLICE REPORTING OF PEDESTRIANS AND BICYCLISTS TREATED IN HOSPITAL EMERGENCY ROOMS
• PREDICTING VEHICLE OCCUPANCIES FROM ACCIDENT DATA: AN ACCIDENT SEVERITY APPROACH
• PREDICTION MODELS FOR TRUCK ACCIDENTS AT FREEWAY RAMPS IN WASHINGTON STATE USING REGRESSION AND ARTIFICIAL INTELLIGENCE TECHNIQUES
• SAFETY BENEFITS OF SPIRAL TRANSITIONS ON HORIZONTAL CURVES ON TWO-LANE RURAL ROADS
• SAFETY EVALUATION OF ALTERNATIVE SIGNAL HEAD DESIGN
• SEASONAL VARIATIONS IN THE AGE-RELATED COLLISION RISK OF ONTARIO DRIVERS
• SPOT SPEED ANALYSIS ON URBAN ROADS IN RIYADH
• TWO PROBLEMS OF AVERAGING ARISING IN THE ESTIMATION OF THE RELATIONSHIP BETWEEN ACCIDENTS AND TRAFFIC FLOW