The effect of traffic characteristics on CO emissions in Bangkok | |
| Author | Chisanu Amprayn |
| Call Number | AIT RSPR no. GE-99-01 |
| Subject(s) | Automobiles--Thailand--Bangkok--Motors--Exhaust gas Traffic engineering--Thailand--Bangkok |
| Note | A research submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. GE-99-01 |
| Abstract | Pollution Control Department (PCD) had provided fixed stations and mobile-car to directly collect the CO emissions from actual air ambient conditions. These CO emissions were represented as the overall quality of ambient air around those observed locations. The fixed stations and mobile-car could not determine the CO emissions that were based on traffic characteristics but the highway motor vehicles caused 60 percent of overall CO emissions. Thus, the purpose of this study is to attempt to determine CO emissions from relationship of traffic engineering concept. Three approaches namely: CO emission based on average speed and emission factor, CO emission based on driving cycle and cycle distance, and CO emission based on speed-acceleration-deceleration frequency were proposed to determine the CO emissions along the two selected study roads: Chaengwattana Road and Ladprao Road. The first approach is based entirely on the average travel speed of traffic observed along the selected study roads. Once the average speed can be determined, then by using emission factors obtained from PCD, the CO emission can be identified. It was known that CO emissions were found to be higher on Ladprao Road than that of Chaengwattana Road due to its lower travel speeds (31.68 kph vs. 39.95 kph). The results obtained from this average speed approach were confirmed by the driving cycle and cycle distance approach as CO emissions found on Ladprao Road were higher than Chaengwattana Road. However, the CO emissions obtained by using the speed-acceleration-deceleration frequency approach revealed the contradicted findings. CO emissions found on Chaengwattana Road in both kg/km and kg/hr units were higher than that of Ladprao Road. The main reason why CO emissions of Chaengwattana Road were higher than Ladprao Road because of traffic volumes observed on Chaengwattana Road were higher even though its average travel speed was higher than Ladprao Road. The contradicted traffic characteristics of being higher volumes but also with higher mean travel speed are due mainly to geometric and land use characteristics of these two roads. On Ladprao Road there are various shops located along the road resulted to higher pedestrians crossing this road. Furthermore, there are number of bus stops along this road resulted to higher delays causing lower travel speeds. Finally, these findings can lead to the conclusion that observed only travel speed without any considerations on traffic volumes could be miss-represented. As traffic volumes are higher, more number vehicles are polluted even though their average travel speeds were lower than others. Thus, in consideration, both traffic volume and travel speeds must be considered together to determine the total emissions of CO. |
| Year | 2000 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. GE-99-01 |
| 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; |
| Examination Committee(s) | Takahashi, Kiyoshi;Pannapa Herabat; |
| Scholarship Donor(s) | Sripatum University; |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2000 |