News

Accessibility for all: Open source options for measuring access to destinations

By Chris McCahill As highlighted in two recent SSTI webinars in March and April of this year, accessibility measures are becoming more useful in practice. The most notable examples rely on proprietary data and methods, but open source approaches are also gaining traction, while highlighting the

Can autonomous vehicles co-exist with bicyclists and pedestrians?

By Robbie Webber While major automakers rush to promote the next level of autonomous features and release videos of hand-free driving, serious questions have been raised about whether autonomous vehicles will be able to safely co-exist with bicyclists and pedestrians. Heather Knight, an expert in

Google’s Street View cars are measuring and mapping air pollution

By Rayla Bellis Last week, Google and the Environmental Defense Fund published the first in a series of maps with data on pollution levels collected using Google Street View vehicles. The initiative, a partnership between EDF, Google Earth Outreach, and San Francisco-based company Aclima, will

Study of variable speed limits highlights the trade-off of throughput and safety

By Sam Sklar Varying a posted speed limit based on current conditions can improve operations and safety in congested work zones, a team from Missouri found.  This study from the University of Missouri-Columbus, called “Evaluation of Variable Advisory Speed Limits in Congested Work Zones,”

Bridging the gap between research and practice: new study on the role of induced vehicle travel

By Mary Ebeling A newly released study sponsored by CalTrans offers a thorough review and analysis of research and practice related to the limitations of existing travel forecasting models. The authors focus on limitations in forecasting induced vehicle travel generated by adding lane miles

The National Complete Streets Coalition announces the best Complete Streets policies of 2016

By Rayla Bellis The National Complete Streets Coalition has released The Best Complete Streets Policies of 2016, the latest edition of the annual report that scores and ranks all of the Complete Streets policies passed during the previous year. Brockton, MA, Missoula, MT, and Wenatchee, WA tied

Road fatalities are disproportionate across both racial/ethnic and rural/urban lines

By Rayla Bellis Recent research examines equity in road fatalities and finds significant disparities across racial/ethnic, income, and geographic lines. The study, from the University of Colorado, includes a spatial analysis of more than 970,000 U.S. road fatalities in the Fatality Analysis

Balancing transportation investments to maximize access: Connecting nonmotorized trips with transit

By Mary Ebeling New research from the Mineta Transportation Institute contributes essential insights into improving transit access for nonmotorized transportation. Researchers assert that a city should develop a low-stress road network while balancing these improvements with the desire for

Reducing traffic congestion in cities by delivering goods at night

By Logan Dredske Shifting store, restaurant, and other business deliveries to nighttime hours could reduce traffic congestion within cities. A study conducted by the KTH Integrated Transport Research Lab (ITRL) in Stockholm, Sweden, has found that scheduling deliveries to businesses during

Return of the Barnes Dance

By Sam Sklar Cities across the U.S. are once again installing a formerly-common intersection treatment: the “Barnes Dance” or pedestrian scramble, which allows pedestrian movements in all directions simultaneously, including diagonally. A new installation in Washington, D.C., demonstrates