Hwy 120 / Union Road, Manteca, CA

 

The City of Manteca has partnered with Caltrans District 10 and the San Joaquin Council of Governments to improve the traffic flow at the State Route 120 and Union Road Interchange. The project will become the first diverging diamond interchange (DDI) in the State of California and improves safety conditions of the intersection by construction new on and off ramps, widening Union Road, and adding Class I shared use paths and Class II bike lanes.

The DDI configuration is a unique configuration that provides cost savings and safety benefits for vehicles and pedestrians. The system takes local road traffic and shifts it to the left side of the road before being shifted back to the right, reducing conflict points resulting from signals and vehicles while allowing traffic to flow more efficiently through the interchange.

BSK provided Quality Assurance testing materials testing to the Resident Engineer on the entire project to include soils, aggregate base, hot-mix asphalt, and concrete, as well as Source Inspection for structural elements. The Source Inspection scope included prefabricated concrete and steel items, as well as anchorage, reinforcing steel and prestressing tendons.