Kolb & Valencia Intersection

Regional Transportation Authority (RTA) | Tucson, Arizona


The purpose of this project is to widen Valencia Road from Wilmot Road to approximately ½ mile east of Kolb Road from four lanes to six lanes as part of the RTA corridor widening of Valencia Road from Ajo Way to Houghton Road. The intersection of Valencia and Kolb was changed to a two-phase traffic signal operation with indirect left turns on the north and west legs, which entailed the design of five traffic signals. The east and south legs have a unique, innovative design where the heavy left-turn movements are guided to turn left onto directional ramps in the north and east directions before merging with the main line roadways. Prior to design, there was extensive analyses of the traffic operations for various configurations and traffic volume scenarios.