Evaluation of green-arrow signals at a T-junction in Bangkok | |
| Author | Sikdar, Prabeer Kumar |
| Call Number | AIT Thesis no. 576 |
| Subject(s) | Traffic signs and signals--Bangkok Traffic engineering Roads--Interchanges and intersections |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The right-turning movement at an intersection contributes to the capacity problem and may cause hazards of conflict. Many studies and creative thinking have been devoted to devise efficient methods for handling this movement at signalized intersections, The present study was conducted to evaluate a modified signal indication displaying an improved signal sequence at a signalized T-junction which had an early cut-off sequence. The criteria of inter-section operation that were evaluated are: capacities, starting delays, and hourly volumes for the major movements of the three approaches. The data for this study were collected using a time-lapse photographic technique during the morning and afternoon peak traffic periods, The flow under saturated conditions for one particular movement as a whole was considered for determining the capacity of that movement. Flows at two levels of saturation were obtained from the cumulative distribution curves. An indirect method, measuring the number of vehicles entering during the first 15 seconds, and the first 20 seconds, of the green phases was used to evaluate the starting delays of the three movements, The observations of \'before\' and \'after\' conditions were compared statistically using the F-test and Student\'s t-test at the 5- and 10-percent levels. Among the favourable effects of the modified signal indications were a significant improvement in capacities of the individual major movements of the approaches, an increase in the flow of the straight-through movement of the approach having no right-turn, and an increase in the hourly volume handled by the three principal movements, This study did not show a significant improvement in the starting delays of right turners from the through road, |
| Year | 1973 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Jones, John Hugh |
| Examination Committee(s) | Williams, F.H.P. ;Drew, Donald R. |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1973 |
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