Paper Information

Journal:   JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY   SPRING 2006 , Volume 8 , Number 1 (28); Page(s) 54 To 66.
 
Paper: 

ANALYZING THE TRAFFIC AND ENVIRONMENTAL EFFECTS OF ACTUATED AND REGULAR TRAFFIC SIGNALS AT THE INTERSECTIONS

 
 
Author(s):  HAJI HOSSEIN LOU M., GOUDARZI AMIR REZA, FEREYDOUNZADEH F.
 
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Abstract: 

SCATS system is one of the intelligent systems of controlling traffic which, using a central computerized system and receiving information from the detectors, issues instructions for scheduled signals at the intersections. This system has been used in many large cities of the world including Tehran. The aim of this report is to propose a method for evaluating the efficiency of this system in Tehran. Up to this date, the operations of the transportation network of the cities before and after the installation of SCA TS system have been compared in different cities and through different methods. For the evaluation, different parameters such as traveling time or delay time and stopping at the intersections have been used. Statistics were obtained from cars at three intersections of Sohrevardi street in Tehran. These statistics included the travel time on the road and also the average delay time at the entrances of each intersection, which were taken before and after the installation of SCATS intelligent system.
The preliminary results show that following the installation of SCATS system, the travel time has decreased by 4 to 37 percent. Also, the average delay for each vehicle at the morning peak hours decreased by 38 percent at Sohrevardi- Keyhan intersection, but increased by 37 and 1 percent at Sohrevardi- Motahari and Sohrevardi- Beheshti intersections, respectively. In regular hours, there has been a decrease of 11 to 37 percent in the delay time at all the three intersections. At the evening peak hours, from less than 1 up to 42 percent decrease in the delay time has been observed.
As there is a direct relationship between the amount of smooth traffic and the travel time on the one hand and the amount of air pollution in the traffic network on the other, by considering the change of travel time between the two intelligent and regular situations, it was tried, in the continuation of the present research, to gain statistics regarding the decrease in the amount of the different pollutants in one cycle of movement on the route, which could show the effects of the environmental use of actuated signals at the intersections. When the signals are intelligent at these three intersections, for paving a short route of 786 meters, 751 kilograms of different pollutants such as carbon monoxide and methane are decreased. In order to reach the final conclusion regarding the operation of the SCATS system, it is proposed that the present study be done for other intersections.

 
Keyword(s): TRAFFIC SIGNALS, INTELLIGENT CONTROL OF TRAFFIC, SCATS SYSTEM, TRAVEL TIME, DELAY TIME, STOPPING AT THE INTERSECTION, ENVIRONMENT, AIR POLLUTION
 
References: 
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