Abstract
The speed - flow characteristics determine the fuel consumption and other road user cost components. Hence, it is necessary to understand the speed - flow characteristics, which directly influence the road user costs. In India, road transportation has come to play dominant role by virtue of its flexibility and the expansion that has taken place in the road network and vehicle technology in the last three decades. In recent past the massive road expansion projects to six lanes and eight lanes are taken up on BOOT/BOT basis. Hence, it is essential to study these changes in speed - flow characteristics of multilane highways, which in turn would be useful in estimating the road user costs. Therefore, an attempt has been made in this paper to present the speed - flow characteristics on Indian highways on multilane highways/expressways in plain terrain. For the present study NH8 Delhi- Gurgaon Access Controlled Expressway have been considered
