Colas Subsidiary Sully-Miller Wins €264 Million Contract to Expand Interstate 10 Corridor in San Bernardino County California

Colas Subsidiary Sully-Miller Wins €264 Million Contract to Expand Interstate 10 Corridor in San Bernardino County California

(IN BRIEF) Colas, through its U.S. subsidiary Sully-Miller Contracting Co., has been awarded a €264 million contract by the San Bernardino County Transportation Authority to expand and improve a 6.2-mile section of Interstate 10 in San Bernardino County, California. The project will add new express lanes in both directions between Pepper Avenue and the Interstate 15 interchange while also widening roads and bridges and upgrading access ramps and highway connections. Several access points will be enhanced with additional auxiliary or acceleration lanes to improve traffic safety and efficiency. Construction is scheduled to begin in April 2026 and continue until fall 2029. The initiative aims to reduce congestion, strengthen freight mobility, and support economic activity across the region. Funded jointly by local, state, and federal transportation budgets, the project highlights Colas’ strategy of expanding its role in delivering complex infrastructure developments in the United States and reflects the company’s continued involvement in major transportation projects across California.

(PRESS RELEASE) PARIS, 11-Mar-2026 — /EuropaWire/ — Colas has secured a major infrastructure contract in the United States through its American subsidiary Sully-Miller Contracting Co., which has been selected by the San Bernardino County Transportation Authority to expand and modernize a key stretch of Interstate 10 in California. The project, valued at approximately €264 million, will involve the construction of new express lanes as well as improvements to existing freight and general traffic lanes along the corridor.

The infrastructure development will span roughly 6.2 miles (10 kilometers) and pass through the cities of Ontario, Fontana, and Bloomington in San Bernardino County. The upgrades are intended to ease congestion, strengthen freight mobility along the corridor, and contribute to the region’s broader economic development by improving one of Southern California’s important transport routes.

Construction work is scheduled to begin in April 2026 and continue through the fall of 2029. The project includes the addition of an express lane in both directions along the section of Interstate 10 between Pepper Avenue and the Interstate 15 interchange. The new lanes will operate with two-way tolling. To accommodate the expansion, Sully-Miller teams will widen existing roadways and several bridges while also modifying access ramps, highway interchanges, and major structural elements connected to the corridor.

The plan also calls for enhancements to multiple access points to support improved traffic flow and safety. Five expressway entry points will be upgraded through the addition of auxiliary lanes or extended acceleration lanes, with three located on the westbound side and two on the eastbound side. In addition, two intermediate access locations will be configured as combined entry and exit points in both directions. Another access point positioned east of the Interstate 15 interchange will provide westbound entry only.

Existing entrance and exit ramps will also be redeveloped as part of the project in order to maintain continuous service and ensure more efficient traffic management once the express lanes are in operation.

Funding for the initiative is being provided through a combination of local resources from San Bernardino County as well as state and federal transportation budgets.

John Harrington, Executive Vice President for the United States, noted that the contract reflects the strong relationship between the company and transportation authorities in California. He highlighted the importance of the project for the region and expressed pride in contributing to a large-scale infrastructure effort that will benefit mobility in San Bernardino County.

Pierre Vanstoflegatte, Chief Executive Officer of the Colas Group, emphasized that the project aligns with the Group’s strategy of expanding its role in delivering complex and large-scale infrastructure developments across the United States. He pointed to the capabilities of Colas teams in providing technical expertise, responsiveness, and engineering know-how to support demanding transportation projects.

The contract also reinforces Colas’ longstanding presence in the U.S. transport infrastructure sector. The Group and its subsidiaries regularly participate in highway development and modernization projects across the country, particularly in California, where they frequently collaborate with the California Department of Transportation as well as local counties and municipalities on major roadway initiatives.

Colas (www.colas.com)

Colas, a subsidiary of the Bouygues Group, is a major player in the construction and maintenance of transportation infrastructure and urban development. Colas covers the entire value chain: from industrial production to service offerings, including construction work. Thanks to its local presence in some fifty countries on five continents, Colas achieved a consolidated revenue of €16 billion in 2025, 59% of which is outside France. With its 62,000 employees, a network of 2,000 operating units comprising 3,500 production units, and nearly 60,000 projects per year, Colas is the trusted partner of its customers. Colas maintains its pioneering, innovative and responsible spirit to connect people and foster the sustainable development of territories.

Media Contacts:

Fabienne Bouloc
Tel. +33 6 67 06 90 21
fabienne.bouloc@colas.com

Caroline Millan
Tel. +33 6 66 40 57 38
caroline.millan@colas.com

SOURCE: BOUYGUES