Connecting Sacramento

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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)

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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)

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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 >


FEATURED RESOURCE

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...

NEWS

Accessibility in practice: A new guide from SSTI

The Virginia Office of Intermodal Planning and Investment recently released its new report, Accessibility in practice: A guide for transportation and land use decision making, developed by SSTI with several partners. The guide describes ways of measuring accessibility and, more importantly, how to use those metrics in planning, project evaluation, and other transportation and land use decisions. The information is useful for any state or local agency interested or already involved in making these kinds of decisions. Read More >

Patent lawsuit puts the breaks on a pedestrian safety option

A recent memo from FHWA has complicated the pedestrian safety campaigns of jurisdictions across the country. According to the memo, FHWA is rescinding interim approval for use of Rectangular Rapid Flashing Beacons, known as RRFBs. The cause of the rescission is a patent lawsuit against the manufacturers of the RRFBs. Read More >

International perspective: Road safety, design, and alcohol consumption

A pair of international studies from Australia and the European Union examined roadway safety. A number of factors help explain why Australia’s traffic fatality rate is less than half of the U.S. rate. And strict blood alcohol content limits can reduce fatalities but must be coupled with supportive policies that reduce alcohol consumption overall. Read More >

How land use and access to transit impact taxi demand

Significant research and debate in recent years have surrounded the impacts of ride-hailing services like Uber and Lyft on transportation systems: whether they reduce the need for personal vehicles, how they contribute to or reduce congestion, and how they impact transit ridership. A recent study published in the Journal of Transport Geography may help shed further light on some of these questions by examining taxi demand and its correlation to land use patterns and access to other travel modes in the Washington D.C. region. As the researchers point out, despite the significant growth of on-demand ride-hailing service providers like Uber and Lyft, taxis remain a key asset for urban mobility that can either complement or compete with other modes. Read More >

Ride-hailing services disrupting ambulances and airports

New reports have indicated unanticipated disruptions caused by ride-hailing services such as Uber and Lyft. Previously, SSTI discussed the positive and negative impacts ride-hailing services have on our transportation systems. Although these new reports focus on changes to ambulance services and airport revenues, they highlight again that ride-hailing services are fundamentally changing our transportation systems. Read More >

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