ARTÍCULO
TITULO

Comparison of exhaust emissions at intersections under traffic signal versus roundabout control using an instrumented vehicle

Claudio Meneguzzer    
Massimiliano Gastaldi    
Riccardo Rossi    
Gregorio Gecchele    
Maria Vittoria Prati    

Resumen

The traditional approach to the comparison of alternative types of road intersection control has focused mainly on efficiency and safety. In recent years, the increasing importance of air pollution produced by vehicular traffic has suggested that environmental considerations should be added to the above aspects as a criterion for intersection design. This study describes a before-and-after analysis conducted on a road intersection where a roundabout has replaced a traffic signal. Using a Portable Emission Measurement Systems (PEMS) installed on a test car, the instantaneous emissions of CO2, NOX and CO have been measured over repeated trips along a designated route. A total of 396 trips have been carried out in different traffic conditions and in opposite directions along the chosen route. Using statistical methods the existence of significant differences in emissions attributable to the type of intersection control has been investigated based on the experimental data. The results indicate that replacing the traffic signal with the roundabout tends to reduce CO2 emissions, even if the differences are not always statistically significant; on the contrary, the signalized intersection performs better in terms of NOX emissions. Finally, results are less clear for CO emissions, and differences are statistically non significant in most cases.

 Artículos similares

       
 
Yang Gao, Jens Fridh, Richard Morrison, Pangbo Ren and Stephen Spence    
This paper numerically investigates stator endwall designs for a mixed flow turbine. One key design parameter studied is the tilting angle of the stator endwall. By examining stator designs with different tilting angles, the aim of this paper is to impro... ver más

 
Kyong-Hyon Kim and Kyeong-Ju Kong    
Devices for reducing environmental pollutant emissions are being installed in ship compression ignition (CI) engines; alternatively, the designs of intake and exhaust pipes and ports are being modified to tune the performance according to the user?s need... ver más

 
Pei-Chi Wu and Cherng-Yuan Lin    
Ships are an important part in international trade transportation and a major source of pollution. Therefore, the International Maritime Organization (IMO) implemented an amendment to the International Convention for the Prevention of Pollution from Ship... ver más

 
Dariusz Kozak and Pawel Mazuro    
Current commercial and heavy-duty powertrains are geared towards emissions reduction. Energy recovery from exhaust gases has great potential, considering the mechanical work to be transferred back to the engine. For this purpose, an additional turbine ca... ver más

 
Jinkyu Park, Iksoo Choi, Jungmo Oh and Changhee Lee    
Exhaust gases from ships and automobiles have a significant impact on people and the environment. As a result, diesel engines used in land and marine vehicles are gradually being restricted, and low-carbon engines are under development. This study consid... ver más