103 research outputs found
Evaluating Streetlight Estimates of Annual Average Daily Traffic in Oregon
Get PDFThis report summarizes the evaluation of Streetlight Data\u2019s Annual Average Daily Traffic (AADT) product by comparing with Oregon Department of Transportation\u2019s automatic traffic recorder data and AADT estimates derived from short term counts in Bend, MPO. Using an evaluation methodology established by Turner et al. (2008), the report concludes that accuracy was measured to be 18% (N = 172) median (mean equals 25%) absolute percent error for the automatic traffic recorder comparison and 32% (N = 66) median (mean equals 59%) absolute percent error for the short term based AADT estimate comparison. Other measures of data quality were reasonable but the accessibility data quality measure would suffer for network wide (all segments in the network) data accessibility since the setting gates for Streetlight Data\u2019s process would be time consuming. Data quality is difficult to fully answer outside the context of a use of the data and its recommended that future evaluations apply the AADT product in a safety, vehicle miles traveled, or air quality analysis to determine the magnitude of difference between currently available data (from models or traditional traffic counts) and these third party data products. Future evaluations should also look at any potential costs savings of purchasing third party data compared with traditional traffic count data collection
Climate Change Vulnerability Assessment and Adaptation Options Study
Get PDFThe Oregon Department of Transportation (ODOT) recognized that the State\u2019s transportation infrastructure is vulnerable to the impacts of extreme weather and climate events. To better understand and respond to these impacts, ODOT conducted a regional vulnerability assessment and adaptation options study. This pilot study identifies vulnerable highway corridors and evaluates a range of site-specific adaptation strategies that address landslides, coastal erosion, and storm surge hazards. The study was prepared with funding from the Federal Highway Administration (FHWA) Climate Change Resilience Pilot Program. FHWA\u2019s Vulnerability Assessment Framework was used to help guide ODOT's evaluation of state highways. The pilot covers Tillamook and Clatsop counties on Oregon\u2019s north coast, within ODOT\u2019s Maintenance District 1. This area is served by ten State highway routes that run along coastal bluffs, rivers and estuaries, and across the Coast Range. Nearly 300 miles of State highways were assessed as part of the study. The project involved: - Analysis of projected climate changes and sea level rise. - Qualitative assessment of vulnerabilities and risks from climate impacts, - Baseline data collection and adaptation strategies developed for high-risk sites, - Benefit-cost analysis, and, - Review of regulatory constraints. ODOT conducted a workshop with maintenance and technical staff to collect climate risk information and identify priorities. Vulnerable hazard sites along north coast highways were identified using the best available climate science, existing conditions data, and known and anticipated hazards information. ODOT ranked highway corridors and critical connections (Seismic Lifeline Routes) for vulnerability to climate impacts. Adaptation options were developed at five locations identified as vulnerable \u201cclimate hazard sites\u201d and selected for analysis within a 25-mile Study Corridor. A benefit-cost analysis was then prepared at two sites to enable comparison between the options and inform the overall assessment. ODOT also reviewed regulatory and land use constraints that have the potential to limit the feasibility of coastal adaptation projects
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