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An expansive new study suggest that contrary to what you might expect, wider traffic lanes in urban areas are often less safe than narrow ones.

United statesSalt lake cityNew yorkReid ewingJohns hopkinsShima hamidiJennifer homendyNational transportation safety boardAmerican associationNew york timesJohns hopkins bloomberg school of public healthJohns hopkins bloomberg schoolAssistant professor shima hamidiProfessor reid ewingState highwayTransportation officials