INFLUENCE OF SIDE FRICTION AND ROADWAY WIDTH ON CAPACITY OF MULTILANE URBAN DIVIDED ROADS
Keywords:
Side friction, urban road, capacity, adjustment factorsAbstract
Urban arterials exhibit deteriorated capacity and poor level of service in many developing countries in recent times. Because of increased social and commercial land use, there are several factors that affect performance of the road in which one significant parameter is side friction. Side friction is defined as the activities prevail on the side of the road such as pedestrian movement, curb side busstops, parking manueovers etc. The present study deals with effect of road side friction on capacity of the urban roads, also attempted to relate roadway width with the capacity. The objective of the study is to derive the adjustment factors for side friction and roadway width which are used to develop a model for estimating the capacity at the urban mid block sections. For this, data was collected from six different sections. Capacity is estimated by using the speed flow relationship for each section. And regression equations are developed to derive the adjustment factors for side friction and roadway width. Further capacity model is proposed by using these adjustment factors. The study finds that there is 21% reduction in capacity of the road under medium to higher level of side friction. It is also observed that the percentage reduction in capacity has been increased by 3.2% with every 2% increase in the side friction activities. The capacity model proposed in the study is simple as well as provides a good estimate of capacity of urban road under prevailing roadway and side-friction conditions.
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