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Basic continuous-time signals include the unit step function, unit impulse function, and unit ramp function, collectively referred to as singularity functions. Singularity functions are characterized by discontinuities or discontinuous derivatives.
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Approach-level real-time crash risk analysis for signalized intersections.

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Real-time traffic and signal data significantly impact signalized intersection safety. Analyzing traffic flow, speed, and signal timing helps predict and prevent crashes, improving roadway safety.

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Area of Science:

  • Transportation Engineering
  • Traffic Safety Analysis
  • Roadway Infrastructure

Background:

  • Intersections are high-risk roadway facilities due to complex traffic dynamics.
  • Traditional safety analyses using aggregated data (e.g., annual average daily traffic) lack real-time accuracy.
  • Averages obscure critical conditions present during crash occurrences.

Purpose of the Study:

  • To investigate the relationship between crash occurrence at signalized intersections and real-time traffic, signal timing, and weather conditions.
  • To differentiate between within-intersection and intersection-entrance crashes for targeted analysis.
  • To develop predictive models for proactive traffic management.

Main Methods:

  • Collected crash data from 23 signalized intersections in Central Florida.
  • Categorized crashes into within-intersection and intersection-entrance types.
  • Developed Bayesian conditional logistic models for each crash type.

Main Results:

  • Within-intersection crashes are influenced by specific approach volumes and flow ratios.
  • Optimized signal timing (left turn adaptability, approach priority) reduces within-intersection crash risk.
  • Intersection-entrance crash risk is reduced by higher average speeds, longer green/waiting times for left turns, and higher green ratios for through traffic.

Conclusions:

  • Real-time traffic and signal parameters are crucial for signalized intersection safety.
  • Specific traffic volumes and signal timing strategies can mitigate crash occurrence.
  • Findings support real-time safety applications and proactive traffic management at intersections.