Portland (Or.). Neighborhood Traffic Management ProgramKittelson & Associates2010-04-192010-04-191991-10https://hdl.handle.net/1794/1031298 p. Illustrationsen-USTraffic circles -- Oregon -- Portland -- EvaluationRoundabouts (Traffic circles)Speed limits -- Oregon -- Portland -- EvaluationMotor vehicles -- Speed -- ManagementAutomobiles -- Speed -- ManagementTraffic accidents -- Oregon -- Portland -- Prevention -- Safety measures -- EvaluationTraffic safety -- Oregon -- Portland -- Safety measures -- EvaluationOther