Risk Assessment for Pedestrian Safety Evaluation at Mid-block Crossings under Mixed Traffic Conditions

Psychological gap size (PGS) is the time gap between the approaching vehicle and the pedestrian, when the pedestrian has just crossed the point of possible conflict. It is a part of the gap accepted by pedestrians, the other part being the actual required gap to safely cross the possible point of conflict. This paper focuses on the development of a risk assessment criteria based on PGS to ensure the safety of pedestrians at mid-block crossing locations in urban areas of India where mixed traffic conditions prevail. Limited lane discipline and negligible yielding by motorists to pedestrians was observed at these locations. Similar conditions are prevalent in other developing countries located in South-East Asia and South America. PGS was identified as the measure of effectiveness to ensure pedestrian safety. It was found varying with several factors but only number of lanes, pedestrian rolling behavior and vehicle peed were found to be statistically significant. Relationships between PGS and vehicle speed were modelled. The risk assessment criteria for different road categories was developed using 15th and 85th percentile PGS values. The 85th percentile was found to be twice as high as the 15th percentile value. The risk assessment criteria can be used as a pro-active tool to examine the severity of pedestrian-vehicle interaction at a location and to identify the type of crossing facility to be installed to ensure safer pedestrian crossings at that location.


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  • Accession Number: 01709545
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 28 2019 7:29AM