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Projects

Reconstruction of I-95-I-91-CT Route 34 Interchange

Reducing traffic congestion and improving safety through reconstruction of a major metropolitan freeway interchange.
  • Underside of I-95 flyover reconstruction - Gannett Fleming

    The new I-95 flyover replaced the existing left-lane exit ramp, increasing safety in the area.

  • I-95 flyover reconstruction in progress - Gannett Fleming

    Construction of the I-95 flyover required nighttime steel erection using 20-minute traffic stoppages.

Client
Connecticut Department of Transportation
Location
New Haven, Connecticut
Our Role
Construction Engineering and Inspection, Concrete Testing.
Data
Size:
1 mile
Construction Cost:
$91 million
Completed:
2012
Type:
New Construction
Duration:
4 years
Outcomes
  • Improved area traffic operations and interstate-to-interstate travel

  • Simplified maintenance of traffic during continued interchange construction

  • Replaced a left-lane exit with a flyover bridge to increase traffic capacity and safety.

This project is part of the Connecticut Department of Transportation's (CTDOT's) $2 billion I-95 New Haven Harbor Crossing Corridor Improvement Program. This multimodal transportation operations improvement program includes more than 7 miles of I-95 in the heavily traveled corridor between New York City and Boston. Daily traffic volume in the project area is more than 140,000 vehicles per day—more than three times the original design volume.

The I-91/I-95/CT Route 34 interchange will include lanes from the new Pearl Harbor Memorial Bridge and three lanes on I-95 through the interchange. More than 20 bridges will be replaced, and looping ramps will be removed. Other planned enhancements include full shoulders, a new median barrier, signing, drainage, and lighting to improve safety and decrease congestion.

What We Did

Gannett Fleming provided construction engineering and inspection services for an interchange reconstruction project to reduce congestion in the New Haven area. The project included the staged construction widening and replacement of two existing CT Route 34 and I-95 bridges and the vertical realignment and widening of the converging I-91 and I-95 southbound ramps to CT Route 34 westbound. Ten new retaining walls were constructed to support new ramp alignments and to relocate the I-95 entrance and exit ramps.

A major component of the project was the construction of a new ramp flyover bridge to carry traffic on I-95 northbound to CT Route 34 westbound and into downtown New Haven. The new flyover bridge increased safety in the area by replacing the existing left-lane exit ramp. The flyover is a ten-span, horizontally curved, twin, steel, box-girder bridge spanning both directions of I-95 and the interchange ramps. The construction of this bridge required nighttime steel erection using 20-minute traffic stoppages. In addition, the construction contract required a contractor-prepared quality control management plan. Gannett Fleming coordinated with the contractor and CTDOT to modify the original phasing plan to resolve construction scheduling issues.

Key Features

  • Maintenance of daily traffic on I-95

  • Construction of 10 retaining walls with architectural form liners to simulate stone

  • Installation of 600 precast-concrete friction piles for new foundations

  • Embankment construction using lightweight fill

  • Inspection of highway drainage installations

  • Relocation of overhead signs onto new sign supports

  • Installation of new incident management system and illumination along I-95

  • Installation of new signalized intersections.

Sustainability Features & Outcomes

  • Used recycled materials in the roadway base and asphalt

  • Completed recycling reports every 6 months, detailing quantities of materials recycled.

Similar Projects: Transportation: Bridges, Engineering, Transportation: Highways, Operations, ITS & Traffic: Incident & Emergency Management (IM/EM), Transportation: Operations, ITS & Traffic, Transportation, Engineering: Transportation