Lateral distribution of vehicles across the carriageway was the most important characteristic of traffic with little lane discipline. The absence of lane behaviour implies that a driver not only interacts longitudinally with the vehicles ahead but also laterally with vehicles on its sides. The discipline of lane based driving can be examined from the lateral position of vehicles across the carriageway. An analysis of lane changing behaviour indicates characteristic differences in lane changing for distinct vehicle-types. In this study, an attempt is made to understand non-lane based behaviour of traffic in which lateral distance keeping behaviour, lane keeping behaviour and lateral behaviour of vehicles are studied. The effect of traffic composition on lane wise headway behaviour of vehicles is studied. In order to analyse the lateral position of vehicles across the carriageway, the central position of vehicles were noted for different vehicle-types. These positions were noted for each of the median, middle, shoulder lanes and the paved shoulders as the vehicles passed a particular reference line on the carriageway. Lateral clearances of various vehicle-types are also compared in this study.