| Author | Vandy Vorasak |
| Call Number | AIT RSPR no. GE-99-11 |
| Subject(s) | Roads--Laos--Interchanges and intersections
|
| Note | A research study submitted in partial fulfillment of the requirements for the degree of
master of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. GE-99-11 |
| Abstract | Traffic accidents and traffic congestion at the intersections of major roads in
Vientiane are caused by improper geometric design. This research study investigated the
existing conditions of the two selected types of intersection in Vientiane: signalized
intersection and unsignalized intersection. In addition, proposed measures were
recommended to improve the conditions of these intersections in particular the geometric
design standard.
In order to reach the desired objectives of the research, capacity analysis was
employed and this capacity analysis is also related to geometric design. Tanner's formula
and shared-lane use method are used to determine the capacity of minor approaches and
left turn from major traffic stream for unsignalized intersection. Capacity of signalized
intersection is determined from flow ratio method and NETSIM American traffic
software. AASHTO method and Australian method (NAASRA) are also used for
geometric design study.
The results indicated that capacity of at-grade intersections can be increased by
improvement of geometrics such as channelization and separated turning lanes. For
signalized intersections, the cycle length is one factor affecting capacity. Thus, proper
design of signal timing is very essential to improve the traffic flows at intersections in
Lao PDR. |
| Year | 2000 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. GE-99-11 |
| Type | Research Study Project Report (RSPR) |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Yordphol Tanaboriboon;Prapansak Buranaprapa; |
| Examination Committee(s) | Takahashi, Kiyoshi;Pannapa Herabat; |
| Scholarship Donor(s) | The World Bank; |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2000 |