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  1. بکارگیری ضابطه نصب فاز محافظت شده گردش به چپ در تقاطع های چراغدار
بکارگیری ضابطه نصب فاز محافظت شده گردش به چپ در تقاطع های چراغدار
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بکارگیری ضابطه نصب فاز محافظت شده گردش به چپ در تقاطع های چراغدار

کامکاری، مهشید Kamkari, Mahshid

Applicaton of warrant for Installation of Protected Left-Turn Phase at Signalized Intersections

Kamkari, Mahshid | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42023 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Nassiri, Habibollah
  7. Abstract:
  8. Left-turn operation is a critical component in the safe and efficient operation of a signalized intersection. The proper type of left-turn phasing results in reduction of traffic delay and number of accidents. A review of the literature indicates that different warrants have been proposed for the installation of the protected left-turn phase; however, there is not a consensus to implement a specific warrant up to the present. In general, the warrants fall into four categories: traffic volume, operational characteristics of traffic, intersection geometrics and accident experiences. Considering the high rate of accidents resulting from left-turn movements at signalized intersections in Iran, it is important to develop some guidelines to identify the conditions in which the installation of a protected left-turn phase is warranted. In this research, the critical gap data at two signalized intersections of Ferdos-Sazmanbarname and Zanjan-Siadat in Tehran, Iran were used to apply the proposed warrant. Results show that the critical capacities of left-turn volume at these two intersections are 540 and 965 vehicle per hour, respectively. It may be concluded that if the observed left-turn traffic volume at an intersection with characteristics similar to any of the intersections studied exceeds the respected critical capacity, the installation of protected left-turn phase at that intersection is warranted
  9. Keywords:
  10. Signalized Intersection ; Left-Turn Movement ; Protected Phase ; Warrant

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