NEW PROJECT: WTI to Create a Guidebook for Transportation Agencies on Unpaved Roads

Gravel road in rural Montana with mountains in the background
The guidebook will aid agencies in making effective decisions regarding conversion of paved roads to unpaved.

For roads with very low traffic volumes, some transportation agencies have found that that these roadways can be maintained more economically and at a higher level of service with an unpaved or granular surface, as compared with attempting to maintain an old paved surface. Through this project, WTI will develop a comprehensive information resource on effective practices for converting severely distressed paved roads to acceptable unpaved surfaces. The guide will be developed based on needs identified in a previous WTI project, NCHRP Synthesis 485 Converting Paved Roads to Unpaved.

Laura Fay, who led the NCHRP Synthesis, will also serve as Principal Investigator for this effort. The main benefit of this project will be the availability of an easy to use guidance document for agencies that operate and maintain low volume roads. The guide will help agencies select candidate roads for conversion, conduct more effective and safer conversions, and communicate with the public on how and why a conversion is taking place.

Additional project information is available on the project page of the WTI website.

NEW PROJECT: MDT and WTI to Continue Research on Bridge Support Systems

WTI, MDT Research on concrete cap for bridge deck support
WTI & MDT Will continue research on concrete cap for bridge deck supports as a long lasting, safe and cost effective solution.

The Montana Department of Transportation (MDT) has found concrete-filled steel tube (CFST) piles connected at the top by a concrete pile cap to be a very cost-effective support system for short and medium span bridges. This type of system offers low initial cost, short construction time, low maintenance requirements, and a long service life. While the gravity load performance of these systems is well understood, their strength and ductility under extreme lateral loads (e.g., seismic events) is more difficult to reliably predict using conventional design procedures.

MDT has sponsored previous WTI research to investigate the performance of these systems under extreme lateral loads and to develop appropriate analysis/design procedures. The primary objective of this research, led by Michael Berry, is to further validate/improve MDT’s CFST to concrete pile cap connection design/analysis methodologies, and to ensure the efficacy of these methodologies for a wide variety of potential design configurations. This research has important potential benefits for evaluating and enhancing bridge performance during earthquakes and other seismic events.

Additional information is available on the project page of the WTI website.

In the News: Streamline Bus Service Celebrates Three Million Rides

Image of passengers boarding Streamline bus. KBZK TV Interviews David Kack about the history and success of the Streamline Bus service.
KBZK TV Interviews David Kack about the history and success of the Streamline Bus service.

The Streamline Bus Service in Bozeman achieved a major milestone in August – 12 years of service and three million rides! KBZK Channel 7 visited the community barbecue hosted by the Human Resources Development Council (HRDC), which operates Streamline, and interviewed WTI’s David Kack on the history and growth of the service over the years. Watch the full news story with David’s interview on the KBZK website.

The Pop-up Traffic Calming Projects, featured in the last issue of Newswire, are also “popping up” in the local news. KBZK Channel 7 traveled to the Bozeman projects locations last week to film the installations in action, and to interview WTI’s Dani Hess (in the rain!). This news clip is available on the KBZK website. The Bozeman Daily Chronicle also featured the story on the front page of the Sunday September 2, 2018 issue.

Vehicle passes over temporary pedestrian crossing.
KBZK TV Interviews Dani Hess about the temporary “Pop Up” traffic calming projects.