A total of ten sections were selected for the study. The data for this study were collected from two-way two-lane undivided roads located in southern parts of India. The objective of this study is to develop free-flow speed prediction models for undivided roads with mixed traffic conditions as they are common facilities in both urban and rural settings in India. It is the desired average speed adopted by the driver when not restricted by other vehicles in the stream under given set of road conditions. Free-flow speed (FFS) is one of the key parameters used to express LOS assessment. Hence, there exists a need to evaluate the performance indicator that reflects the current level of service (LOS) of a road facility. In developing countries like India, the transportation system is characterized by limited roadway infrastructure and the lack of operation and management experience. While majority of the previous research efforts were focussed on estimating the influence of side frictional elements on performance of divided urban roads, the model proposed in this study will be useful to find the capacity particularly for undivided urban streets under prevailing side friction conditions.
These parameters were further shortlisted based on statistical measurers, then standardized using ‘feature scaling method’ and finally used as design variables to model the ‘reduction in capacity’. Some of these parameters are conceptualized in this study and rest are taken from literature. A number of parameters were considered under different side friction elements.
Capacity under the influence of side friction was observed significantly lower (up to 60.73%) than the capacity of base section of the same carriageway width. Relationship between carriageway width and capacity was determined in absence of side friction. Capacity of both base and non-base sections were estimated using ‘fundamental diagram method’. To extract side friction data, the carriageway width was divided into ten equal segments by using longitudinal virtual lines. The research is based on the data collected from six base sections and ten non-base sections located in different cities of India. on-street parking, pedestrian movements and non-motorized vehicles. Three elements of side friction were considered in this work viz. Side friction is a composite variable signifying the degree of interaction between regular traffic flow and other surrounding activities. The primary aim of this research is to analyse the influence of side friction on the capacity of undivided urban streets.
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