Roadway, Highway & Bridge

Mark Thomas is a recognized industry leader in the planning, design, and delivery of roadway, highway, interchange, and bridge improvement projects. Our experience includes minor localized widening projects and intersection improvements, grade separations and arterial reconstructions, HBP rehabilitations and replacements, and highway widenings and interchanges. We have unrivaled expertise in navigating the Caltrans project approval and delivery process.

SR 120/Union Road Interchange

Manteca, CA

This unique project features the first Diverging Diamond Interchange (DDI) designed in the State of California. Mark Thomas led the design of this innovative interchange, working closely with the City of Manteca and Caltrans District 10 on the preparation of the project approvals. The new DDI configuration was not in the Caltrans Highway Design Manual (HDM) - our team coordinated with Caltrans District 10 and Headquarters to gain acceptance of the design concept, and ultimately, final design.

We also incorporated a ribbon path - a grade separated Class I bike path through the new interchange - to eliminate all bicycle/vehicle conflict points, as Union Road is a key crossing of SR 120. The new Class I path provides a 12-foot wide trail with slab bridge structures underneath the entrance/exit ramps and on the SR 120 overcrossing.

I-280/I-880/Stevens Creek Boulevard Interchange Improvements

San Jose, CA

Mark Thomas developed solutions to enhance operations and safety for the highly-congested interchanges adjacent to one of the busiest shopping malls in the cities of San Jose and Santa Clara. The project evaluated a wide variety of geometric alternatives such as constructing a new access from the freeway to Winchester Boulevard, closing a local street, constructing a flyover ramp to the Valley Fair Mall parking lot and providing an exclusive lane from off-ramp to Monroe Street. The newly constructed interchange has reduced traffic congestion and delays by eliminating weaving and merging movements, and improved access and safety for bicycle and pedestrian traffic.

Folsom Boulevard Streetscape Improvements

Rancho Cordova, CA

Mark Thomas designed improvements Folsom Boulevard to transform it into a pedestrian and bicycle friendly corridor, improve safety at Sacramento Regional Transit (RT) rail crossings, calm traffic, and improve connectivity and beautification to streetscapes to enhance City’s identity and development opportunities. Folsom Boulevard is a corridor with special historical significance to the Sacramento area. Folsom Boulevard was the route of US 50, and the main thoroughfare into and out of Sacramento, until the new freeway was built in the 1970s.

Placentia Avenue Railroad Grade Separation

Placentia and Fullerton, CA

Mark Thomas designed geometric alignment alternatives, addition of right-turn lanes at intersections, signing and striping, and ADA corridor improvements to lower Placentia Avenue approximately 25 feet under the BNSF railroad tracks in the cities of Placentia and Fullerton. During design, significant utility investigation and coordination with utility companies was required. We developed creative solutions to avoid the relocation of a series of SoCal Edison transmission lines and poles, saving $6 million.

State Route 4 Bypass

Contra Costa County, CA

Mark Tomas designed this new 13-mile combination freeway, expressway, and highway project in eastern Contra Costa County. The project included a new two to six lane mainline facility, five interchanges, including one freeway to freeway and four local interchanges, and numerous intersections and local roadways. After completion of construction, project was accepted into the State Highway System as the new alignment for State Route 4.

I-5/Cosumnes River Boulevard Interchange and Roadway Extension

Sacramento, CA

Mark Thomas prepared programming, project approval, and construction documents (PSR, PR, FHWA Concept Approval Report, and PS&E) for this 3.2-mile extension of Cosumnes River Boulevard in South Sacramento, including a new interchange at Interstate 5 and a 945 foot overhead structure spanning UPRR and Morrison Creek. The project included constructing a four to six-lane road, railroad overhead crossing, creek crossing, five intersections, and new L-9 interchange that connects to Interstate 5.

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