The present study is undertaken to achieve the following objectives: (i) To collect data for calculation of head time of different vehicles on six lane urban roads under conditions of mixed traffic. (ii) Use actual field data collected from traffic monitoring sites on six-lane urban roads to determine free moving speed (FFS). (iii) Establish a relationship between headway and free traffic speed for a six-lane urban road under mixed traffic conditions. Traffic conditions on Indian roads are heterogeneous in nature. It consists of fast vehicles like cars, other motorized vehicles, and slow vehicles like bicycles. These vehicles differ significantly in their physique, size, motive power, control and guidance system, and performance. The difference between static and dynamic characteristics of different value affects the traffic flow. Indian traffic characteristics are fundamentally different from those of developed countries, due to the mixed traffic flow. This complex traffic scenario, which is particularly prevalent on urban roads in developing countries, poses a significant challenge for traffic planners and engineers looking for suitable solutions. Solutions to the traffic problem can be found through a systematic study of all relevant characteristics of mixed traffic, using appropriate models that will reproduce the traffic flow on the ground. The main hypothesis behind the project is to evaluate the relationship between headway and free flow speed based on real data in mixed traffic conditions. On most urban roads in India, traffic consists of an unsegregated flow of different types of vehicles. Traffic in most developing countries like India is heterogeneous, comprising vehicles......paper......and those in city centers. Arteries essentially last longer in terms of travel; also provides access to adjacent commercial and residential land uses. Collector streets provide both access to the territory and circulation in commercial, residential and industrial zones. Urban roads are classified between local streets and multi-lane suburban and rural highways in highway transportation facilities. Downtown streets are signalized facilities that often function as arterial roads during rush hour. The difference is determined primarily by the function of the streets, the control conditions and the character and intensity of roadside development. Multi-lane suburban and rural highways differ from urban roads in the following ways: development along the roads is not as intense, the density of traffic access points is not as high, and signalized intersections are spaced more than 3.0 km apart..