Loading...
| Friend's email | |
| Your name | |
| Your email | |
| enter code | |
This page was sent successfuly
- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 47165 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Vaziri, Manouchehr
- Abstract:
- Compared to systematically signalized intersections, in the absence of any systematic instruction or signalization at unsignalized-prioritized intersections and due to lower levels of control, driver performance strongly steps in as a decisive factor of intersection traffic and geometric design. Therefore, the study of driver behavior at these intersections appears necessary. This thesis aims to study driver behavior at four prioritized intersections where the minor stream has to yield right of way to the main stream in the city of Mashhad, Iran. Following extraction of raw statistical data from extensive filming, the initial database was constructed consisting of 29 variables. Based on the initial database, a developed database including 25 new variable was created. Results specify that permissible speed in only one of the intersections was consistent with the 1994 AASHTO regulations and within the rest, observed and measured permissible speeds exceeded speed limits stated by 1994 AASHTO. In studying driver behavior with respect to the regulations of AASHTO 2011, vehicles were divided into two categories, namely those which stopped at the approach entry of the intersection and those that did not. Except for one of the four studied intersections, non-stopping vehicles, emerging from the minor street and performing the “through” movement did not exhibit AASHTO’s assumption of adopting 60 percent of the minor stream’s design speed and the approach speeds in the other three intersections proved to be typically lower than that of AASHTO 2011’s. Thus, apparently, instead of applying standings and figures from AASHTO 2011 for vehicles performing the “through” movement from the minor stream, their actual observed approached velocities should be used. Other comparative results with regard to AASHTO 2011 are as follows:
a. Observed time intervals between braking points and intersection entries closely match with time intervals suggested for decision point to intersection entry by AASHTO 2011.
b. Observed time intervals between braking points and passing times also match with those of AASHTO 2011.
c. Required lengths of the triangle of sight for the minor street were less than that of presented by AASHTO 2011 in all intersections of interest.
d. Required lengths of the triangle of sight for the main street were greater than that of suggested by AASHTO 2011 in all intersections of study.
e. Extant lengths of the triangle of sight for the main street were less than that of provided by AASHTO 2011 in all examined intersections.
Regarding non-stopping vehicles performing right and left-turning maneuvers from the minor street, comparisons with AASHTO 2011 regulations reveal that:
a. Required time intervals between decision point and right-turn completion were observed to be less than equivalent ASSHTO-recommended values for all intersections. Regarding the left-turn movement, the same time interval happened to be measured greater than that of AASHTO’s assumptions.
b. Required lengths of the triangle of sight for the right-turn maneuver from the minor street were observed to be less than equivalent values provided by AASHTO in three out of four cases. Regarding the left-turn maneuver, the same lengths were measured to be less than AASHTO’s estimates in two cases out of four - Keywords:
- Drivers Behavior ; Intersection Sight Distance Analysis ; Yield Control ; Intersection Geometric Design
Digital Object List
-
محتواي کتاب
- view
Bookmark