- An analysis of the effects of commuter rail on population deconcentration.
- A look into prioritizing pedestrians at signalized intersections.
- A study of cyclist-vehicle interaction.
- An evaluation of an eco-driving intervention.
OTREC researchers Krista Nordback and Sirisha Kothuri will present research at the North American Travel Monitoring Exposition and Conference (NATMEC) from June 29 to July 2, 2014.
The conference, organized by the Transportation Research Board, provides an opportunity for traffic monitoring professionals to share information about collecting and using traffic data.
Nordback will talk about what professionals can do to maintain bicycle count programs at the state level. She will give a presentation on the feasibility of using existing traffic signals to collect bicycle counts, and on what to do with that data once it is gathered.
Kothuri will present strategies for counting pedestrians using existing resources such as signal controllers and software already installed at intersections.
Nordback and Kothuri will draw from their own research as well as from the work of Miguel Figliozzi, Chris Monsere, ...
Read moreOTREC research from Portland State University has developed a new method of travel demand modeling for pedestrian trips.
Transportation professionals use travel demand modeling to forecast how many people will be using a given portion of the transportation infrastructure. This is typically done using a four-step process, the first step of which relies upon a basic unit known as a transportation analysis zone, or TAZ.
A TAZ is a relatively coarse unit of space that can vary in size depending on planners’ needs; typically it encompasses somewhere around 3,000 residents.
Planners started using TAZs in the 1950s, on mainframe computers with limited capabilities, for guidance in making highway investment decisions. As transportation modeling practice has evolved, computers are capable of processing more data and models are being increasingly relied upon to answer more complex questions.
Despite growing investment in infrastructure that supports active forms of travel, existing modeling tools often poorly represent the nuances of the pedestrian environment. The project’s principal investigator, Kelly Clifton of Portland State University, explores ways to improve upon the modeling tools currently in existence.
... Read moreNote: In advance of the Transportation Research Board's annual meeting, the biggest forum on the transportation research calendar, OTREC.us is profiling some of the researchers who will present their work.
How long is too long to wait for the light to change? At stoplights, pedestrians often experience longer delays while cars are given priority.
To design traffic signals that serve the needs of walkers, planners must understand the motivations behind pedestrian behaviors.
Working with professors Kelly Clifton and Christopher Monsere, Sirisha Kothuri of Portland State University created a survey designed to shed some light on what makes pedestrians decide to follow, or not follow, traffic laws.
To collect data, Kothuri and a team of graduate students armed with an 11-question survey posted themselves at four different intersections in northeast Portland, Ore.
Two of the intersections had recall signals, where pedestrians are automatically detected, and the other two had actuated signals, where pedestrians must press a button to get the light to change.
Survey respondents were asked for their attitudes about delay in signal timing, and for the reasons that determined their crossing the street.
Responses showed...
Read moreThe NITC program's executive committee has selected a new roster of projects for funding under the National Institute for Transportation and Communities, or NITC, program. The committee chose 10 projects, totaling $900,000, under the NITC theme of safe, healthy and sustainable transportation to foster livable communities.
The projects are national in scope and reflect priority areas including transit supply and outcomes, and pedestrian and bicyclist behavior.
Projects selected include:
- A bicycle and pedestrian miles traveled project for Washington state.
- A study that measures the effectiveness on social media on advancing public transit.
- A look into crowdsourcing the collection of data on transportation behavior.
- A national study of Bus Rapid Transit outcomes.
A complete list of projects and principal investigators is below:
- National Study of BRT Development Outcomes: Arthur Nelson and Joanna Ganning, University of Utah
- Crowdsourcing the Collection of Transportation...
An OTREC project recently took an in-depth look at the travel-time and health-related effects of a new implementation of a state of the art adaptive traffic system.
Southeast Powell Boulevard is a multimodal urban corridor connecting highway US-26 through Portland, Oregon. The corridor is highly congested during morning and evening peak traffic hours. In October 2011, an adaptive traffic system called SCATS was deployed.
The primary function of SCATS, or Sydney Coordinated Adaptive Traffic System, is to mitigate traffic congestion. Using sensors (usually inductive loops) at each traffic signal, the system tries to find the best cycle time and phasing along the corridor as traffic demand patterns change.
In this integrated multimodal study, OTREC researchers looked at the corridor’s traffic speed and transit reliability, before and after the implementation of SCATS. In addition, a novel contribution of this study was to study the link between signal timing and air quality.
To determine the impact of SCATS on traffic and transit performance, researchers established and measured performance measures before and after SCATS. The researchers used data provided by TriMet, Portland's transit authority, to compare transit times before and after SCATS as well as traffic volume data from two Wavetronix units that were installed by the City of Portland; these units collect traffic counts, speeds and classifications. For the air quality study, TriMet also...
Read moreIBPI, or the Initiative for Bicycle and Pedestrian Innovation, is a center for research and learning that is focused on bicycle and pedestrian travel.
Based at Portland State University, the group's aim is to advance bicycling and walking as integral elements of the transportation system in Oregon’s communities. July 24 -26 IBPI hosted a faculty workshop to help transportation professors integrate bicycle and pedestrian topics into their courses.
Aimed at faculty members teaching transportation courses within an accredited planning or engineering program at the university level, the workshop included curriculum, guidebooks, and field trips to gain first-hand knowledge of bicycle and pedestrian facilities in Portland, Oregon.
It was kept small, to allow for discussion and interaction. The workshop's 15 participants were first given the chance to describe the existing gaps in their courses and what they hoped to gain from the workshop, then guided through a two-day series of activities tailor-made to fit their needs.
Their goals ranged from specific to general, requesting ways to incorporate GIS analysis into bicycle and pedestrian courses, suggestions for how to integrate active travel performance measures with typical vehicular performance measures, and generally a deeper understanding of bicycle research.
Robert Bertini (Portland...
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