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Department for Transport commissioned the Transport Research Laboratory (TRL) to conduct a literature review to consider the role of infrastructure in the causation and reduction of injuries to cyclists. It was undertaken as part of the wider research programme, road user safety and cycling, being led by TRL.
Overall, it proved problematic to draw definitive conclusions from the literature. Taken as a whole, the most significant infrastructure-related risk factors for cyclists in single vehicle incidents on highways appear to be; slippery road (due to weather), and poor or defective road surface. For multi-vehicle collisions the infrastructure risk factors appear to be; posted speed limits, and encounters with other road users at junctions.