Gap Acceptance Behavior of Right-Turning Vehicles at T-Intersections - A Case Study

This paper deals with the study of the gap acceptance of major to minor road and minor to major road right turning vehicles at limited priority T-intersections in India (vehicles are driven on the left side in India). The unsignalized intersections in India are uncontrolled or partially controlled; analyzing such intersections is complex. Limited priorities are observed at partially controlled intersections, where major and minor roads are perceived by drivers based on intersection geometry and traffic volume and speed on the approaches. Field data were collected at four T-intersections with limited priority using video cameras. The data extracted includes gap/lag, subject vehicle type, conflicting vehicle type, and driver's decision (accepted/rejected). Different distributions are fitted to the available and accepted gaps. Based on Kolmogorov-Smirnov (K-S) test, it is found that gamma distribution fits the available gaps well, whereas accepted gaps are better represented with lognormal distribution. Binary logit models are developed for gap acceptance for both turning movements. For model development, 80% of the extracted data (total data observations are 722 for major road right turning vehicles and 1066 for minor road right turning vehicles) are used and remaining are used for model validation. The percentage of correct prediction by binary logit models are 74.48% (for major road right turning) and 81.51% (for minor road right turning). Critical gaps estimation revealed that maximum likelihood method gives the most consistent results. The critical gaps are smaller than the values reported for developing countries.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02580500
• Supplemental Notes:
  • Abstract reprinted with permission of the publisher.
• Authors:
  • Patil, Gopal R
  • Sangole, Jayant P
• Publication Date: 2015

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 44-54
• Serial:
  • Journal of the Indian Roads Congress
  • Volume: 76
  • Issue Number: 1
  • Publisher: Indian Roads Congress
  • ISSN: 0258-0500

Subject/Index Terms

• TRT Terms: Case studies; Developing countries; Gap acceptance; Logits; Right turns; T intersections; Unsignalized intersections
• Geographic Terms: India
• Subject Areas: Highways; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 01572028
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 31 2015 5:59PM