Relationship Between Time Mean Speed and Space Mean Speed on Main Streets in Bangkok

Abstract

Abstract

The aim of this research is to study the relationship between space mean speed and time mean speed along with some other variables on the main streets in Bangkok. This relationship can be used to estimate the space mean speed to determine the real traffic condition on the road section. The time mean speed data were obtained from the image processing camera, the space mean speed data were obtained from license plate, and other variables such as the number of lanes, the number of u-turn, the number of bus stops, the length of road, etc. were collected by field survey. Then the models were developed using linear regression analysis by separating into 4 cases 1) The analysis by the overall traffic 2) Analysis by the section of road 3) Analysis by the length of road and 4) Analysis by the traffic condition. The adjusted R2 of the developed models for the case of analysis by the overall traffic, analysis by the section of road, analysis by the length of road and analysis by the traffic condition were 0.304 -0.459, -0.007 – 0.288, 0.241 – 0.470, 0.247- 0.502 respective. Moreover, the most accurate case based on adjusted R2 is the analysis by traffic condition.

Keywords : Image Processing Camera; Space Mean Speed; ime Mean Speed