Agency: 
American Council of Engineering Companies of Massachusetts (ACEC/MA)
Client: 
Massachusetts Department of Transportation (MassDOT)
Project: 
Route 2 Safety Improvement Project at Crosby’s Corner in Lincoln and Concord, Massachusetts

The American Council of Engineering Companies of Massachusetts (ACEC/MA) recognized Louis Berger with the 2017 Bronze Engineering Excellence Award for its work on the Route 2 Safety Improvement Project at Crosby’s Corner in Lincoln and Concord, Massachusetts.

Louis Berger served as the lead designer and, in addition to managing the project, provided highway, traffic and structural design; environmental permitting and mitigation; and construction phase services.

Route 2 is an important arterial highway in Massachusetts, extending from downtown Boston to the New York State Line. It is the only east-west highway across the northern part of the state and thus provides important access to Boston for population centers across that region. The Route 2/Route 2A Crosby’s Corner junction was one of the busiest and most dangerous intersections in Massachusetts, with approximately 50,000 vehicles per day using the roundabout.

Louis Berger used complex engineering design concepts to provide safety improvements at Crosby’s Corner while accommodating vehicular and pedestrian traffic during construction. The innovative solution included:

  • A new 4-lane divided highway with a 135-foot single span bridge overpass at the intersection of Crosby’s Corner.
  • Six local service roads that run parallel to Route 2.
  • 1.5 miles of gravity and cantilever retaining walls that vary in height up to 30 feet and feature unique treatments such as colored stone facing and striations and colored stone form liners.
  • A nature‐based wetland design with a complex phased construction sequencing program to minimize impacts on wildlife and wetland plants.
  • A landscape design that reflects the historical, semi-rural character of the area by including the use of native shrub and tree species throughout the corridor.

The benefits of the project include the ability to safely and efficiently accommodate traffic, provide safe access to the residences and businesses located along the project corridor, and preserve the eco system in the area.

ACEC/MA is the business association of the Massachusetts engineering industry, representing over 120 independent engineering companies engaged in the development of transportation, environmental, industrial, and other infrastructure. ACEC/MA is a member organization of the American Council of Engineering Companies (ACEC) based in Washington, D.C.