News

Conventional practice fails to account for induced traffic, even when the public demands it

By Eric Sundquist The problem of induced traffic, aka induced demand, is well-documented in the literature. Yet it is too rarely accounted for in practice. A new paper by Jamey M.B. Volker (University of California-Davis) and co-authors examines the environmental documents from five major highway

All-way stop signs reduce crashes by one-third

By Chris McCahill From 2009 to 2016, the District Department of Transportation (DDOT) in Washington, DC, converted 60 intersections from two-way stops (allowing free flow on the major route) to all-way stop control. A new study in the Transportation Research Record looks at 53 of those

County wants to make informal paths safer, more formal

By Robbie Webber Montgomery County, MD, is asking residents to mark the informal paths that they have been using to reach destinations. Many paths are worn through woods, cul-de-sac ends, and beaten into the grass where good pedestrian connections don’t exist. The county is updating its

Recent trends in school travel mode choice

By Rayla Bellis A recent study analyzed trends in travel to school in the U.S. using 2017 National Household Travel Survey Data and explored factors that impact mode choice. Among the findings, the study shows that the share of students walking and biking to school has increased since 2009 and

Getting transportation equity right

By Eric Sundquist Historian Ibram X. Kendi’s “How to be an Anti-Racist” was already a bestseller before the death of George Floyd, and now it resonates even more strongly. “Kendi’s ideas—that few, if any, are free of racism; that we should confess to our own racism as a first step

Major roads undercut safety benefits of highly accessible places

By Chris McCahill In working with transportation agencies across the U.S., our team often faces questions about the role of safety in accessibility analysis. While we know the safety and comfort of streets clearly impacts access for people on foot or bicycle, the effects of accessibility on

“Dear diary, I took the bus today!” – Cost-efficient travel behavior influencers

By Saumya Jain “Soft” transportation policy measures can influence a significant reduction in personal car use, according to a new research published in Transportation Research Part D. The Behavioral Toolkit identifies six psychological variables that can affect travel behavior: attitudes;

New study finds AV tech less likely to detect darker-skinned pedestrians

By Marybeth McGinnis Clarification: This article should have made clear that the study “Predictive Inequity in Object Detection” examines camera-based machine-learning object detection systems, which are one component of full camera-lidar-radar based detection systems. In addition, the paper

Is bigger better?

By Michael Brenneis New analysis of Fatality Analysis Reporting System data by the Insurance Institute for Highway Safety (IIHS) points to crashes being more survivable for drivers of large SUVs than for drivers of smaller cars. Per million registered vehicle miles, driver deaths have been

Windshield bias among transportation professionals shifts safety burden onto pedestrians

By Chris McCahill Transportation professionals who spend more time behind the wheel tend to believe distracted walking plays an overstated role in pedestrian deaths, according to a new Rutgers study. This belief can steer professionals toward trying to correct pedestrian behavior, rather than