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A driving simulator study of driver performance on deceleration lanes.

A Calvi1, A Benedetto, M R De Blasiis

  • 1University Roma Tre, Department of Sciences of Civil Engineering, via Vito Volterra 62, 00146 Rome, Italy. calvi@uniroma3.it

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Drivers often decelerate too early and too fast on freeway exits, increasing crash risks. Driving simulator data reveals actual performance differs from design models, especially in low traffic volumes.

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Area of Science:

  • Traffic Engineering
  • Human Factors in Transportation
  • Road Safety

Background:

  • Deceleration lanes are critical for safe freeway exit maneuvers.
  • High accident rates are frequently reported on exit ramps, particularly within deceleration lanes.
  • Existing models for deceleration lane design may not accurately reflect real-world driving behavior.

Purpose of the Study:

  • To investigate driving performance during freeway exit maneuvers using a driving simulator.
  • To analyze the impact of varying traffic volumes on driver behavior in deceleration lanes.
  • To compare simulated driving performance with assumptions used in deceleration lane design.

Main Methods:

  • A driving simulator study involving 30 participants.
  • Simulation of three distinct traffic volume scenarios.
  • Collection of data on lateral position, speed, and deceleration during exit maneuvers.

Main Results:

  • Drivers initiate deceleration earlier than assumed in design models, potentially disrupting main traffic flow.
  • Speeds at the end of deceleration lanes often exceed ramp curve design limits, creating hazardous conditions.
  • Low traffic volume correlates with higher exiting speeds and earlier deceleration initiation, but not significantly with end-of-lane speeds or lane-changing locations.

Conclusions:

  • Actual driver behavior during freeway exits deviates significantly from standard design assumptions.
  • Current deceleration lane designs may not adequately accommodate observed driving patterns, contributing to safety issues.
  • Traffic volume influences some aspects of exiting behavior, but end-of-lane speeds remain a concern across different volumes.