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I-5 Expansion and Remodeling Analysis: City of Seattle

I-5 Expansion and Remodeling Analysis: City of Seattle. CEE498 GIS Final Project Matt Elliott Tina Jang Justin Hughes Karina Pineda Amber Yamamoto. http://www.phenry.org/wsh/i5.html. Project Overview. Objectives Area of Study Data Collection Considerations Data Analysis Conclusion.

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I-5 Expansion and Remodeling Analysis: City of Seattle

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  1. I-5 Expansion and Remodeling Analysis:City of Seattle CEE498 GIS Final Project Matt Elliott Tina Jang Justin Hughes Karina Pineda Amber Yamamoto http://www.phenry.org/wsh/i5.html

  2. Project Overview • Objectives • Area of Study • Data Collection • Considerations • Data Analysis • Conclusion

  3. Objectives • Improving system performance • Decrease traffic congestion • Increase safety in accident prone areas

  4. Area of Study • I-5 corridor from milepost 162 to milepost 178

  5. Data Collection • Digital orthophoto of area • Roads • Wetlands • Bridges • Milepost Markers • Infrastructure • Accident Rates • Traffic Flow Rates • Right of Way • Attenuators • Guardrails • Cross Culverts

  6. Considerations Need based: • Areas prone to traffic congestion and accidents Cost based: • Environmental impact on wetlands • City right of way • Cost of construction • Existing Infrastructure

  7. Need-Based Analysis Need analysis was based on the need for lane widening and reconstruction of ramps. A ranking of 1 thru 4 (based on severity) was done for congestion for AM peak and PM peak, accidents, and injuries resulting from accidents. These rankings were then summed in order to find the total need as seen in the map.

  8. Cost-Based Analysis Cost analysis was based on the cost of construction, considering existing infrastructure. A ranking of 1 thru 4 (based on number of units in a given segment) was done for parcels within 150 ft of I-5, buildings within 170 ft, as well as wetlands and bridges intersecting the freeway segments . These rankings were then summed in order to find the total ranked cost as seen in the map.

  9. Calculated Values

  10. Rating System

  11. Conclusion I-5 near Northgate is one area identified as needing improvements. The relatively low-cost ranking for this section of freeway makes it a cost-effective area for improvement. Reconstruction or widening of the ramps in this area can improve system performance by decreasing traffic congestion while increasing safety.

  12. Resources • http://wagda.lib.washington.edu/ • http://www.wsdot.wa.gov/mapsdata/geodatacatalog/default.htm • Puget Sound Traffic – Congestion Map Archive, www.wsdot.wa.gov • Heather Rein, of WSDOT

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