| Author | Surasak Taweesilp |
| Call Number | AIT Thesis no.TE-97-05 |
| Subject(s) | Roads--Thailand--Bangkok--Interchanges and Intersections
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Intersection delay in Bangkok causes a lot of economic losses. It increases both
road user cost and social cost. One reason for intersection delay is improper setting of
traffic signal timings at intersections. The purpose of this study is to develop a delay
formula and an optimal cycle time formula for intersections in Bangkok.
Delay formula and optimal cycle time formula were developed by using
simulation data. The data were simulated by executing simulation program TRAFNETSIM. The program was calibrated by using data from an intersection in Bangkok.
Delay formula was developed by modifying the HCM generalized formula for Bangkok
traffic conditions. Modification necessitated determining the appropriate parameters of
HCM formula. The optimal cycle time formula was developed by two approaches. The
first approach is running the simulation to find out the optimal cycle time for various
traffic conditions. Then regression analysis is applied to develop the formula. The second
approach is using the delay formula and the optimization technique to determine the
optimal cycle time, in which total intersection delay was minimized by varying the cycle
time.
From this study, new delay formula and optimal cycle time formula were
developed. Both of them predict almost the same result as Webster's delay and optimal
cycle time formula for undersaturation conditions. However, for near saturation and
saturation conditions the two formulas give better estimate result than Webster's
formulas. |
| Year | 1998 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Transportation Engineering (TE) |
| Chairperson(s) | Nakatsuji, Takashi; |
| Examination Committee(s) | Yordphol Tanaboriboon ;Minato, Takayuki; |
| Scholarship Donor(s) | The Royal Thai Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |