The IIHS study, in collaboration with George Washington University, Oregon Health and Science University and New York University, analyzed the injury risks associated with different types of bike lanes.

Protected bike lanes, which are physically separated from vehicle traffic via a barrier, were found to be increasingly effective when installed on a bridge or raised roadway, as opposed to on a standard street.

According to the study, cyclists on two-way protected bike paths on bridges or raised roadways are at a much lower risk for a crash or fall than if they had been traveling on a major road with no bicycle infrastructure.

However, cyclists on two-way protected bike paths at street level were found to be at much higher risk for a crash or fall than if they had been traveling on a major road with no bicycle infrastructure, the study said.
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