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I-205/Sunnyside NB Onramp

I-205/Sunnyside NB Onramp. Miroslava Stolyar Almir Zelkanović David Demchak Jake Wright Slavik Franchuk. CE 454 Urban Transportation December 3, 2008. OVERVIEW. Preliminary site investigation Analysis and evaluation of existing conditions Data collection Proposed modifications

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I-205/Sunnyside NB Onramp

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  1. I-205/Sunnyside NB Onramp Miroslava Stolyar Almir Zelkanović David Demchak Jake Wright Slavik Franchuk CE 454 Urban Transportation December 3, 2008

  2. OVERVIEW • Preliminary site investigation • Analysis and evaluation of existing conditions • Data collection • Proposed modifications • VISSIM design • Evaluation of constructed network

  3. Site of Interest Right lane turn from Sunnyside Rd I-205 NB Onramp Stevens Rd

  4. CLAIMED CONDITIONS: • The westbound right turn lane from Sunnyside Rd onto I-205 NB experiences high traffic demandcontrolled with a yield sign • Lane utilization through intersections upstream including Sunnyside/Stevens and Sunnyside/101st is in favor of the northernmost lane which further adds to the volume of traffic • Long queues backed through the Stevens and 101st intersections cause drivers to make ill advised lane change choices

  5. COUNTY MODELED CONDITIONS Syncro data obtained from Clackamas County Transportation Department

  6. PROPOSED MODIFICATIONS Remove the yield sign and extend the right turn lane from Sunnyside Road onto the I-205 NB Onramp. Added lane

  7. CONCLUSION • No mitigation deemed necessary • Model errors were reduced by calibration • Quick fix involves modifying signal phases/timings • The modification used (extension of turning lane) is a considerable expense but will greatly reduce the generated queues

  8. THANK YOU

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