Connecting Sacramento


Connecting Sacramento is the first study to incorporate both accessibility analysis and tripmaking data, including data from multiple sources, and assess how they can be used together to guide transportation- and land use-related decisions. This study focused specifically on opportunities to improve first- and last-mile connections to light rail transit in Sacramento, but its findings are widely applicable. Read More >

Accessibility in practice (SSTI and Virginia Office of Intermodal Planning and Investment, 2017)


Planning agencies and transportation decision makers often talk about the importance of improving access to destinations, but they rarely have the tools or resources to measure accessibility and incorporate those metrics into decision making. This report guides agencies through that process. Read More >

Effects of Parking Provision on Automobile Use in Cities: Inferring Causality (McCahill, Garrick, Atkinson-Palombo and Polinski, 2015)


Automobile use has been on the rise in cities for nearly a century and so has the supply of parking. Because driving often seems unavoidable, policymakers, developers and the public push endlessly for more parking to meet demand. That push, however, might only be making matters worse. SSTI Senior Associate Chris McCahill’s research suggests that abundant parking in cities causes people to drive more, shedding important light on the question of cause and effect. Read More >


Trip-making data, TDM, and connectivity in Northern Virginia (SSTI and Michael Baker International, 2016)

Commercially available GPS data offers valuable new insight about trip origins, destinations, and routes, including short trips that travel demand models often cannot capture. Using this data, SSTI worked with Michael Baker International, the Virginia DOT, and local stakeholders to identify opportunities for managing travel demand and improving connectivity throughout Northern Virginia. This final report describes the full data set and 17 selected case studies, along with recommended projects and policies, estimated costs, and benefits for each. More Resources...


Millennials are driving more, but only those making the least money

The new 2017 National Household Travel Survey gives us our first look at changing travel habits since the recession. From what we can tell, the average American drives less in 2017 than eight years earlier. Driving also seems to have increased considerably among Millennials—but mostly among those with the lowest incomes—bucking expectations. The results may indicate that those with higher incomes are now choosing to live where they need to drive less. Read More >

Florida’s pedestrian record could have been much worse

Until recently, Florida had the dubious distinction of being rated the most dangerous state for pedestrians. However, a new study shows that things could have been even worse in Florida. Researchers estimate that Florida’s Complete Streets law, passed in 1984, saved 3500 lives between when the law was passed and 2013. Florida’s pedestrian fatality rates decreased nearly 60 percent after Statute 335.065 was adopted, but transportation agency experts interviewed for the study said the state still has a long way to go. Read More >

Seattle’s parking reforms

The Seattle City Council passed a number of parking reforms earlier this month to further support the city’s ongoing efforts to become less car-oriented, advance local climate change goals, and reduce housing costs in the city. Seattle is one of many cities to recognize that its parking regulations are outdated, but one of relatively few to take major steps toward reform. Read More >

Dynamic tolling benefits highway users in congested areas

Congestion pricing is gaining a foothold in the management of highway vehicular travel, and with good reason. Congestion pricing, sometimes called demand-based pricing or dynamic tolling, is in the early stages of adoption by state DOTs as a congestion-management practice. But evidence from Virginia, Washington, and Utah’s dynamically-tolled lanes show that DOTs need to be careful how they set their toll rates to manage traffic flow. Read More >

Anticipating the costly impacts of climate change in Hawaii

Hawaii has estimated the price tag will be $15 billion to raise, push back, or relocate highways to address concerns over rising seas levels because of climate change. High surf is already damaging some highways, and initial estimates indicate about 15 percent of all HDOT highways will be susceptible to rising sea levels. Read More >

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