Impact of modern roundabouts on vehicular emissions : comparison with signalized and un-signalized intersections | |
| Author | Rahmat, Mohibullah |
| Call Number | AIT Thesis no.TE-10-01 |
| Subject(s) | Roads Interchanges and intersections--Environmental aspects Traffic circles--Environmental aspects |
| Note | A thesis submitted in partial fulfillment of the re quirements for the degree of Master of Engineering in Transportation Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TE-10-01 |
| Abstract | Steady growth of traffic over the years has put env ironmental stress on urban centers in various forms particularly causing poor air quality. Urban air quality is generally poor at traffic intersections due to variations in idle timing and vehicles’ speeds as they approach and leave. Modern roundabouts can reduce the idle time of vehi cles resulting in reduced air pollution. The primary objective and focus of this research is to study the impact of modern roundabouts on vehicular emissions compared to signalized intersec tions. Twelve existing intersections were selected with respect to traffic volumes, percentag e of heavy vehicles, geometry of the intersection and vehicle speeds. Traffic operation of the intersections was videotaped and traffic data was extracted from the tapes. Analysis was con ducted using a 3.2 Version of Signalized and Unsignalized Intersection Design and Research Aid ( SIDRA) software. The results obtained from this analysis were recorded. Secondly, the sa me data set was entered to the software while the types of existing intersections were converted to modern roundabouts and the results were recorded. The two results were compared in terms of the total amount of four measures of effectiveness (MOEs) namely CO2, CO, NOX and HCs in (Kg/h). The findings from the study illustrated a significant reduction in total amount of the MOEs after conversion of currently operating intersections to modern roundabouts. Simi larly, the level of service, average delays and vehicle speeds were also considerably improved |
| Year | 2011 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TE-10-01 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Transportation Engineering (TE) |
| Chairperson(s) | Kunnawee Kanitpong |
| Examination Committee(s) | Nakatsuji, Takashi;Thirayoot Limanond |
| Scholarship Donor(s) | AIT Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2010 |