NH Route 28 Widening & Signalization

Derry, New Hampshire

Client: Town of Derry, New Hampshire


  • Bid Administration
  • Construction Observation
  • Permitting
  • Right-of-Way Coordination
  • Roadway Design
  • Stormwater Management

Project Summary

Hoyle, Tanner was selected by the Town to help alleviate a traffic “bottle neck” within a heavily traveled commercial district. NH Route 28 in the project area accommodates 22,000 vehicles per day and numerous business and side road access points. Existing signalized and non-signalized intersections were first analyzed then animation models created to visualize the proposed additional signalization and roadway widenings. An added thru lane, turning lanes, and interconnected signal system increased roadway capacity and improved traffic operations.

Early project efforts included stormwater coordination with the design of a large off-site commercial development located up gradient in the watershed. Stormwater analysis of existing conditions involved complex urban “open” and “closed” combined systems. The drainage design retrofit existing conveyances to update aged infrastructure – meeting pre vs. post runoff requirements resulting in minimal impacts to upstream and downstream conditions. A porous pavement sidewalk was added to the design to decrease the volume of water exiting the site by infiltration.

We assisted the Town with Right-of-Way negotiations by providing site impact plans and alternative development concepts. We utilized “3D” modeling to map existing facilities. We minimized utility conflicts by designing around existing structures and lines where possible to the benefit of project stakeholders. Hoyle, Tanner prepared contract documents and assisted the Town in bidding the project in the Fall of 2011. We provided construction administration and resident engineering services during construction.

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