Portland State University

By Jennifer Dill, Ph.D.
Professor, Urban Studies & Planning 
Director, TREC

This week I’m at the International Travel Survey Conference in Australia. The conference happens every three years, attracting over 100 geeky people who spend time thinking about things like stated preference experiments, smartphone data collection, combining sampling frames, and respondent burden. I presented some work from our five city Green Lanes project, comparing our survey data with “objective” measures, such as videos and traffic counts. The focus was on intersections, where the protected lane is no longer separated from motor vehicles. An example of one design used in Portland, OR is shown in the adjacent figure.

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Some of the comparisons are...

The video begins at 0:39.

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Abstract: The geometric design of our urban arterials and collector streets can provide more room for nonmotorized travelers, make street crossings easier for pedestrians, and help to control traffic speeds, thus reducing pedestrian, bicycle and automobile crashes. In this seminar Mr. LaPlante will show how this can be done within existing rights-of-way and within tight maintenance and construction budgets, thus making better use of taxpayer dollars. The seminar also will address some of the myths about Complete Streets and how we can begin moving forward in making all our street networks complete.

Speaker Bio: John LaPlante is currently Director of Traffic Engineering for T.Y.Lin International, working out of their Chicago office. Prior to joining the firm in 1992, Mr. LaPlante had been with the City of Chicago for 30 years in various transportation engineering positions, including Chief City Traffic Engineer and Acting Commissioner of the new Department of Transportation. He has been involved in several national committees (PROWAAC, AASHTO Green Book Technical Committee, NCUTCD Pedestrian Task Force, and the TRB Pedestrian Committee) and was principal author of the AASHTO Pedestrian Guide. He has taught many courses as part of the...

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Abstract: Traffic safety engineering continues to rely on the traditional methods of design and operational guidelines, correlated to post-crash outcomes, in an attempt to understand the safety attributes of our roadway system.  The recently published Highway Safety Manual provides the newest source of methodologies and statistical models that can be applied to help predict or modify safety outcomes. Additionally, Road Safety Audits are a commonly used practice to gain the insight and experience of traffic and safety experts in an effort to avoid or solve a perplexing and/or unexpected safety problem.  Although none of these activities are completely void of human factors considerations, the ability to directly consider driver behavior, driver comprehension, and the impact of driver decision making in the analysis is incredibly complex and often omitted.  The use of full-scale driving simulators as a research and analysis tool may help significantly reduce the complexity of human factors-based consideration in the context of safety analyses and provide a new and effective tool to improve the safety of our roadway system. This lecture will consider several safety issues facing transportation agencies, namely median crossover crashes, permissive left-turn crashes, and roundabout safety, presenting thoughts and findings on related research.  Additionally, this lecture will integrate the attributes...

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Some researchers have tried to categorize cyclists’ levels of traffic stress utilizing facility or traffic data that can be readily measured in the field, such as motorized travel lanes, travel speeds, and type of bicycle infrastructure.

This seminar will present data and modeling results utilizing two novel data sources:

(a) real-world, on-road measurements of physiological stress as cyclists...