Traffic Research

The traffic-related research projects in the NHDOT research program have focused on signage and highway pavement markings. These projects provide information that can improve safety on New Hampshire highways.

Traffic-related Challenges Addressed by Research


Determining a Strategy for Efficiently Managing Sign Retroflectivity in New Hampshire (14282V)

Experimental Traffic Control Device Testing at New Hampshire Toll Plazas - Purple Lights for E-ZPass Wayfinding (14282O)

  • Researcher: Vanasse Hangen Brustlin, Inc.
  • Date: 2007
  • Final Report

PMMA Retro-Reflective Beads for Traffic Paint (13739, TPF 5(024))

  • Researcher: University of New Hampshire Advanced Polymer Laboratory
  • Date: 2005
  • Final Report

Waterborne Traffic Paints - A Study for the Potential Improvement in Drying Time and Cost-Effectiveness (12323T)

  • Researcher: University of New Hampshire Advanced Polymer Laboratory
  • Date: 2000
  • Final Report

Crashworthiness of Thin-Walled Aluminum and Steel U-Channel Sign Posts (95-8)

  • Researcher: Texas Transportation Institute
  • Date: 1995

The NHDOT has utilized dual aluminum direct-burial tube supports and steel u-channel for much of its highway signing. Current Federal Aid requirements allow only the use of supports that have been crash tested in accordance with NCHRP 350 guidelines. The Department, in cooperation with the Vermont Agency of Transportation, contracted to have a series of crash tests performed at the TTI Proving Ground in Texas.