Year: 2018

Have you thought about how you’ll get to work (or home? or the grocery store?) over the next two decades? Under requirements for long-range transportation planning, state departments of transportation and regional metropolitan planning organizations are required to have a multimodal transportation plan with a minimum time horizon of 20 years. Because manufacturers and shared fleet operators suggest that CAVs will be present on the highway system in significant numbers well before 2038, the planning community will require procedures and methods to address the potential positive and negative direct and indirect outcomes from their deployment.

In response to this, TRB's National Cooperative Highway Research Program (NCHRP) recently published Research Report 896: Updating Regional Transportation Planning and Modeling Tools to Address Impacts of Connected and Automated Vehicles, co-authored by RSG. Volume 1 of the report summarizes guidelines to help agencies update their modeling and forecasting tools to address expected impacts of connected and automated vehicles (CAVs) on transportation supply, road capacity, and travel demand components. Volume 2 explores ways to develop new planning and modeling processes that include CAVs in the transportation environment.

Find more, including a presentation that can be adapted for presentations to agency decision makers, here.

Is transit dying? While transit agencies once celebrated that millennials were unusually predisposed to use transit and live in urban areas served by transit, today we find that the demographic boost is largely over. The TransitCenter recently published “Growing Up and Away from Transit,” co-authored by RSG’s Greg Spitz. The article explores this shift, what it may mean for the future of transit, and what transit agencies will need to do to keep up.

Noise barriers do not just block noise, but can also generally change the way noise is experienced around them. To further explore this issue, the Transportation Research Board (TRB)’s National Cooperative Highway Research Program (NCHRP) recently published the RSG-coauthored report Field Evaluation of Reflected Noise from a Single Noise Barrier, which analyzes the characteristics of sound reflected from a noise barrier to the opposite side of a highway. Residents living opposite newly added single noise barriers sometimes complain about increased traffic noise. Currently available analytical tools are limited in their ability to evaluate this reflected noise and some of the subtle changes in the quality of sound that can occur when it is reflected. Therefore, it is a challenge to determine conclusively if complaints about reflected noise are the result of actual or perceived changes in noise characteristics, and to identify locations where absorptive surface treatments could be beneficial.

The study compares reflected noise from sound barriers with different surfaces and examines both the levels, frequencies, and quality of reflected noise to better understand how it is experienced by communities. The report is accompanied by several appendices, a tool, and a guide. Learn more and check them out at: http://www.trb.org/NCHRP/Blurbs/178305.aspx

While car manufacturers once touted their acceleration and high performance, now, it’s the included safety features that garner the most attention. RSG Director Jonathan Slason shares his recent experience with new assisted driving technology in his article “A Plea for Drivers to Slow Down… Assisted by In-Vehicle Technology.”

Did you know that meteorology can affect the sound adjacent to highways? RSG will be leading a Transportation Research Board (TRB) webinar on September 25 titled, “Meteorological Effects on Roadway Noise.” Presenters will describe the quantitative research and public outreach materials that state highway agencies can use to screen for meteorological influences and explain the effects to the public. Presenting alongside RSG's Ken Kaliski will be Roger Wayson of AECOM, Darlene Reiter of Bowlby and Associates, and Erik Salomons of TNO. It will be moderated by Aaron Hastings of Volpe Center.

Learn more and register at: https://webinar.mytrb.org/Webinars/Details/1220

RSG Director Chris Leggett’s research was published in the latest issue of the Journal of Environmental Economics and Management. The article, “Estimating the Value of Lost Recreation Days from the Deepwater Horizon Oil Spill,” describes a recreation choice model developed for the National Oceanic and Atmospheric Administration (NOAA) to assess recreation-related losses resulting from the spill.