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I-5/Willamette River Crossing Project #: 7068
<br />October 14, 2005 Page 3
<br />as compared to Oregon Department of Transportation (ODOT) traffic counts at each location.
<br />This discrepancy was accounted for in the post-processing.
<br />Figures 1 – 6 reflect a range of traffic volumes on each roadway segment. The range is presented
<br />because the LCOG forecasts appear to reflect a certain degree of fluctuations due to potential
<br />overcapacity conditions system wide. These fluctuations can be “smoothed” by presenting
<br />ranges. At the level of analysis we’re performing as part of this phase of the process, the ranges
<br />are appropriate as they can help inform stakeholders about the number of travel lanes that would
<br />be required on each facility in each scenario but do not identify precise intersection delays or
<br />volume-to-capacity ratios.
<br />Roadway Volume Comparisons
<br />Table 1 presents a comparison of the daily traffic volume forecasts on key roadway links for
<br />each interchange category.
<br />Table 1 Approximate Roadway Traffic Volumes (vehicles per day)
<br />LocationYear 2025
<br />2025 Needed
<br />Cross-
<br />No Build/ Category
<br />Year 2002 Section
<br />Category 4 Category 1 Category 2 3A Category 3B
<br />I-5 North of 50,000 – 75,000 – 90,000 – 90,000 – 95,000 – 95,000 – 8 lanes
<br />Franklin55,00080,00095,00095,000100,000100,000
<br />I-5 North of 60,000 – 90,000 – 80,000 – 85,000 – 65,000 – 60,000 – 8 lanes;
<br />Glenwood 65,00095,00085,00090,00070,00065,000Category 3
<br />may only
<br />require 6
<br />Franklin east 15,000 – 30,000 – 25,000 – 25,000 – 25,000 – 25,000 – 5 lanes
<br />of Glenwood 20,00035,00030,00030,00030,00030,000
<br />Franklin near 25,000 – 40,000 – 40,000 – 45,000 – 35,000 – 40,000 – 7 lanes
<br />Walnut30,00045,00045,00050,00040,00045,000
<br />Franklin near 30,000 – 40,000 – 40,000 – 40,000 – 35,000 – 40,000 – 7 lanes
<br />th
<br />35,00045,00045,00045,00040,00045,000
<br />11
<br />Glenwood 3,000 – 5,000 – 10,000 5,000 – 5,000 – 15,000 – 5,000 – 3 lanes
<br />south of 5,00010,00010,00020,00010,000except 3A
<br />Franklinwhich may
<br />require 5
<br />lanes
<br />Agate south of 5,000 – 5,000 – 10,000 5,000 – 5,000 – 5,000 – 5,000 – 2 – 3 lanes
<br />Franklin10,00010,00010,00010,00010,000
<br />Ferry Street 55,000 – 65,000 – 65,000 – 65,000 – 65,000 – 65,000 – 6 lanes
<br />Bridge65,000*70,00070,00070,00070,00070,000
<br />Note: Category 1 = full interchange at Franklin; Category 2 = new ramps to/from the north at Franklin; Category 3A = split
<br />configuration using Franklin and Glenwood to connect the two interchanges; Category 3B = split configuration using frontage roads
<br />along I-5; Category 4 = upgrade Glenwood to a conventional diamond
<br />*Ferry Street volumes estimated from model. No traffic volume counts were available for Ferry Street at time of analysis.
<br />As shown in Table 1, for the most part, there is little fluctuation in traffic volumes between each
<br />of the categories. The fluctuation that does occur does not change the number of travel lanes that
<br />will likely be needed on each of the roadway segments evaluated. The traffic volumes on I-5
<br />north of Franklin may increase by up to 20 percent if the ramps are provided to/from the north at
<br />Franklin; however, the estimated increase may not change the number of lanes needed.
<br />Kittelson & Associates, Inc. Portland, Oregon
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