News

SSTI releases Connecting Sacramento: A trip-making and accessibility study

By Chris McCahill For several years, SSTI has worked to advance best practices in the use of two emerging technologies: accessibility metrics and trip-making data from mobile devices. Our recently completed study, Connecting Sacramento, was an essential part of that effort. This study brings

Who pays for roads? Users, but only partly

By Eric Sundquist Most readers of this blog are well aware that subsidies are common across transportation modes. But it’s useful to have the numbers, and so periodic reports by the Tax Foundations, which supports “simplicity, neutrality, transparency, and stability” in the tax code, are

How much does parking really cost (in time, fuel, and frustration)?

By Robbie Webber INRIX, a company that provides both software and data services in the realm of transportation and mobility, has issued a report on the cost of “parking pain.” Instead of focusing on the cost of a parking spot, the report looks at the time, wasted fuel, and congestion caused

Real-time travel information: Better for businesses, better for travelers

By Logan Dredske Real-time travel information on digital screens placed in popular gathering areas allows for more efficient time management by transportation users of all modes. Tysons Corner Center, a shopping center in northern Virginia, uses Traveler Information Displays (TIDs) that provide

What HOV requirements in Jakarta can teach us about congestion

By Sam Sklar According to a new paper from three researchers at Harvard and MIT, removal of a strict High-Occupancy Vehicle (HOV) policy had negative effects on traffic in Jakarta, Indonesia, the world’s second largest metropolitan area. Congestion increased even on streets with no

Cleaning up the commercial diesel truck industry

By Logan Dredske Greenhouse gas emissions and fuel usage are being reduced through advances in clean diesel truck engines and emissions control systems. Diesel Technology Forum recently released its research detailing the impact clean diesel truck technologies are having on the nation’s

A toolkit to measure and value “community severance” due to traffic

By Erin Evenhouse A high-traffic road can divide a community in more ways than one. Researchers haven’t always been able to show to what extent such roads can harm a community’s access, health, or quality of life. A new study outlined in the latest volume of the Journal of Transport and

Does legalized marijuana lead to more car crashes?

By Rayla Bellis As more states legalize recreational use of marijuana, decision makers are seeking to understand the implications for safety and public policy. A number of recent studies have examined whether states that have legalized marijuana are seeing higher incidence of car crashes and road

Safety in numbers and safety by design: A ‘virtuous cycle’

By Chris McCahill Two recent studies reiterate what makes safer walking environments: more pedestrians, according to one; and well-connected networks of local streets, according to the other. Taken together, these studies build upon growing evidence that the safety benefits of cities designed for

Alcohol and gasoline prices: Their impact on traffic fatalities and the economy

By Logan Dredske Alcohol and gasoline prices are having unexpected impacts on traffic fatalities, as well as causing damage to economies. A study by Onyumbe Enumbe B. Lukongo, an economics professor at Southern University and A&M College in Louisiana, explored the relationship between per