Canada-based infrastructure and mining engineering firm HNTB announced it has expanded its Connecticut office to support major growth in its transportation business.

The firm said it expanded its presence at 55 Capital Blvd. in Rocky Hill to accommodate what it called 50 percent growth in the number of transportation professionals it employs in the past year.

The expansion is in response to the increased demand for HNTB’s services and meeting clients’ transportation needs in the region, HNTB said.

“The Connecticut office has grown significantly in the past few months,” Jacob Argiro, HNTB Connecticut office leader and vice president, said in a statement. “We’ve attracted talent from all over to come work on some of the most critical transportation projects in the state. As a result, we’ve expanded our office space to accommodate for this growth.”

HNTB has been involved in several major transportation programs in Connecticut, contributing expert planning, design and construction services for approximately 40 years. The firm has been involved in shaping key infrastructure in the area, including Gold Star Memorial Bridge, Route 8/Interstate 84 Interchange Mixmaster Rehabilitation Project, Norwalk River Railroad (WALK) Bridge Replacement Project, Downtown Crossing New Haven Initiative and providing engineering services for the New Haven-Hartford-Springfield Rail Corridor.