Speed – Density Relationship at Federal Route 50 from Batu Pahat to Ayer Hitam
SPEED – DENSITY RELATIONSHIP AT FEDERAL ROUTE 50 FROM BATU PAHAT TO AYER HITAM
RAUDHAH BINTI JA’AFAR, Ahmad Raqib bin Ab. Ghani
Department of Geotechnical and Transportation Engineering Universiti Tun Hussein Onn Malaysia febquariox@yahoo.com
ABSTRACT There is no published relationship between speed and density for Federal Route 50 Batu Pahat to Ayer Hitam. Report in Traffic Study Malaysia indicates the relationships of speed and traffic flows for uninterrupted flow facilities. Federal route is a road consists of junctions and carrying high through traffic volume. This study is conducted towards producing the relationships between speed and density for Federal Route 50. The relationships was developed using an existing traffic flow models. The specific aim of study is to determine which model is appropriate with respect to federal route traffic characteristics. The relationships of speed and density are the parameters that are very important for planning and modelling of transportation facilities. In this study, travel speed and traffic flow were collected at several selected sites. The collected data were analyzed based on Greenshields, Greenberg, Underwood and Drake Model. The result of the analysis study has shown that Underwood Model is the most suitable model that can be used to define the relationships between speed and density based on Malaysia road condition. This study also indicates that several factors such as distance between junctions, speed limits and adjacent land use activities affect the value of mean travel speed on federal route. Key words: Speed; Flow; Density INTRODUCTION Speed is defined as rate of motion, as distance per unit time, generally in miles per hour (mph) or kilometres per hour (km/h). Rate of flow represents the number of vehicles passing a point during a time interval less than 1 hour, but expressed as an equivalent hourly rate. Density is defined as the number of vehicles occupying a given length of lane or roadway, averaged
RAUDHAH BINTI JA’AFAR, Ahmad Raqib bin Ab. Ghani
Department of Geotechnical and Transportation Engineering Universiti Tun Hussein Onn Malaysia febquariox@yahoo.com
ABSTRACT There is no published relationship between speed and density for Federal Route 50 Batu Pahat to Ayer Hitam. Report in Traffic Study Malaysia indicates the relationships of speed and traffic flows for uninterrupted flow facilities. Federal route is a road consists of junctions and carrying high through traffic volume. This study is conducted towards producing the relationships between speed and density for Federal Route 50. The relationships was developed using an existing traffic flow models. The specific aim of study is to determine which model is appropriate with respect to federal route traffic characteristics. The relationships of speed and density are the parameters that are very important for planning and modelling of transportation facilities. In this study, travel speed and traffic flow were collected at several selected sites. The collected data were analyzed based on Greenshields, Greenberg, Underwood and Drake Model. The result of the analysis study has shown that Underwood Model is the most suitable model that can be used to define the relationships between speed and density based on Malaysia road condition. This study also indicates that several factors such as distance between junctions, speed limits and adjacent land use activities affect the value of mean travel speed on federal route. Key words: Speed; Flow; Density INTRODUCTION Speed is defined as rate of motion, as distance per unit time, generally in miles per hour (mph) or kilometres per hour (km/h). Rate of flow represents the number of vehicles passing a point during a time interval less than 1 hour, but expressed as an equivalent hourly rate. Density is defined as the number of vehicles occupying a given length of lane or roadway, averaged
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