New study details non-emission particulates

Greenhouse gas emissions from vehicles deserve a lot of attention, but particulates from vehicles are also a significant health concern. Tiny soot particles can be inhaled deeply into the lungs. Larger-sized particles can contaminate nearby fields and groundwater, and deliver a significant dose of microplastics to surface waters. Of the microplastic particles polluting surface waters, 30 percent originate from tire wear, according to new research by German and U.S. scientists.

Do mileage-based congestion fees hit low-income drivers harder?

While there is mounting evidence that demand-based pricing—or congestion tolling—can more efficiently manage highway use, serious concerns continue to arise regarding the system’s disproportionate impacts on low-income drivers. However, a recent study by researchers at Purdue University has found that a less onerous tax alternative may exist—one that combines congestion tolling with mileage-based user fees or a VMT tax.

TNC revolution may improve access for low-income communities

New research by Anne Brown finds that transportation network companies are invading auto-access deserts, serving disadvantaged lower-income populations, and offering an alternative to the historically discriminatory taxi industry. By studying data provided by Lyft, the author found that, by some measures, Lyft reached 99.8 percent of the population of Los Angeles County, narrowing the mobility gap for underserved populations.

Creating a transportation decision-making process that is equitable for everyone

The focus of a new publication from the Greenlining Institute is to “offer planners and community advocates a step-by-step guide to a more community-centered transportation planning process that focuses on the mobility needs of communities and puts affected communities at the center of decision-making.” While the work is specific to California, the framework holds value for communities across the country.

Opportunities and potential bias in new transportation data

A new issue brief from the Center for American Progress examines congestion on roadways in the United States and considers the potential and pitfalls of new data sources, such as those provided by private ride hailing companies including Uber and others. Although cities are eager to access these private sources of data, the report warns that planners should be careful of relying too heavily on these sources.

Bicycle level of stress and equity as factors in project selection

A paper published in the International Journal of Sustainable Transportation suggests integrating accessibility by bicycle, equity, and project selection to tackle the isolation and segregation of low-income neighborhoods in Baltimore. Using bicycle Level of Traffic Stress (LTS) to measure both access to common non-work destinations and disparities in access across different neighborhoods, the authors suggest that projects can be prioritized to improve outcomes for residents that do not own cars and struggle to reach destinations to meet their daily needs.