01099344

Component

https://doi.org/10.3141/2088-12

http://scholar.google.com...ltun&publication_year=2008

An empirical study was conducted of driver behavioral theory of multilane freeway traffic flow and capacity drop. The study focused on a freeway segment with a horizontal curve located in a stretch of the O-1 highway approaching the European side of the Bosporus Bridge in Istanbul, Turkey. The stretch behaves as a recurrent bottleneck in the afternoon peak. Flow data were extracted manually from video recordings taken from stations along the highway stretch and then converted into cumulative vehicle count curves constructed for each lane at the count stations. Radar detector data taken from a point within the horizontal curve were used to construct an occupancy–flow diagram. The empirical results show that drivers behave in some respects as outlined in the theory. For example, drivers in the median lane do not redistribute themselves across lanes although their speeds are below those in the shoulder lane, as opposed to the theory, but redistribution occurs later. This implies that more than speed differential across lanes affects driver behavior in the median lane. Flow differences and then equalization were observed in the median and shoulder lanes in free-flow and congested-flow states, respectively. There was a fast-moving queue in the median lane in a semicongested state while free-flow conditions in the shoulder lane were prevailing, in harmony with the theory. A relation between capacity drop due to bottleneck activation and bottleneck segment density is also presented.

01121596

English

pp 109-116

2008

Transportation Research Record: Journal of the Transportation Research Board

9780309126038

Print

Figures (8) ; References (8) ; Tables (1)

Behavior; Bottlenecks; Empirical methods; Freeways; Highway capacity; Lane occupancy; Median lanes; Peak hour traffic; Traffic congestion; Traffic counts; Traffic flow; Traffic flow theory

Free flow (Traffic); Horizontal curvature

Turkey

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Jan 29 2008 4:29PM

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• Empirical Measurement of Freeway Oscillation Characteristics: An International Comparison
• Estimating Acceleration and Lane-Changing Dynamics from Next Generation Simulation Trajectory Data
• Estimating Individual Speed–Spacing Relationship and Assessing Ability of Newell’s Car-Following Model to Reproduce Trajectories
• Evaluation of Corridor Traffic Management and Planning Strategies That Use Microsimulation: A Case Study
• FASTLANE: New Multiclass First-Order Traffic Flow Model
• From Existing Accident-Free Car-Following Models to Colliding Vehicles: Exploration and Assessment
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• Macroscopic Modeling Framework Unifying Kinematic Wave Modeling and Three-Phase Traffic Theory
• Microsimulation Calibration Using Speed–Flow Relationships
• Modeling Driver Behavior as Sequential Risk-Taking Task
• New Behavioral Model for Microscopic Freeway Traffic-Flow Simulation
• On-Ramp Metering Based on Three-Phase Traffic Theory Downstream Off-Ramp and Upstream On-Ramp Bottlenecks
• Oversaturated Freeway Flow Algorithm for Use in Next Generation Simulation
• The Less-Than-Perfect Driver: A Model of Collision-Inclusive Car-Following Behavior
• Use of Microsimulation to Model Day-to-Day Variability of Intersection Performance
• Validity of Trajectory-Based Calibration Approach of Car-Following Models in Presence of Measurement Errors
• What Do Different Traffic Flow Models Mean for System-Optimal Dynamic Traffic Assignment in a Many-to-One Network?