The Use Of Hard Shoulders As A Turning Lane: A Safety Evaluation

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Presentation transcript:

The Use Of Hard Shoulders As A Turning Lane: A Safety Evaluation By: Taariq Dollie and Marion Sinclair The Use Of Hard Shoulders As A Turning Lane: A Safety Evaluation

Introduction Road congestion increases Increased travel times Frustrated road users Finding ways to reduce travel time

ADJACENT LANE TURNING LANE ROAD SHOULDER

Is it safe? Influential factors? Road geometrics? Legislation?

Methodology Identified 5 intersections Traffic counts Speed differentials Identified conflicts Methodology

Locality Map

Results

Factors affecting road shoulder usage Sight distance Queue length Speed of the preceding vehicle Signal timing Factors affecting road shoulder usage

Site Number Average speed in the shoulder (km/h) Average speed in the adjacent lane (km/h) Speed difference (km/h) 1 43 52 9 2 42 37 5 3 51 46 4 63 73 10

Site Number Total number of pedestrians using the road shoulder Total number of cyclists using the road shoulder Total number of conflicts at each site 1 9 51 2 10 15 3 35 33 4 5 14

Conclusion Initial investigation into this phenomenon No clear relationship between this phenomenon and the geometrics and traffic conditions It is likely that this phenomenon is a consequence of human habit There is a concern for the interaction between motorized and non-motorized transport Conclusion