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Background traffic volumes, were entered into the Traffix model. It should be noted that
<br />the background volumes, were modified to reflect a slight change in travel patterns, due to
<br />the Twin Lakes, Parkway connection. This change is consistent with the methodology
<br />completed for the Twin Lakes, AUAR Update.
<br />• The Traffix model was used to distribute the trips, from future developments, to the
<br />adjacent roadway network. The output includes, both the number and percent trips, from
<br />each future development to each individual intersection. From this data, the number and
<br />percent trips, were calculated for roadway segment improvements,, where applicable.
<br />• Traffic volumes, for both scenario B and C were distributed through the Traffix model in
<br />order to determine their respective impacts, at each intersection and roadway segment.
<br />Improvement costs, were allocated based on the percent of vehicles, from each
<br />development using each intersection or segment.
<br />• The background traffic volumes, that were as signed are considered a City/County cost.
<br />While both scenarios, B and C were distributed through the Twin Lakes, redevelopment
<br />area, scenario C was used as the controlling land use scenario from which to develop the
<br />cost allocation. Scenario C represents, the most likely development scenario based on the
<br />area demographics, and projected market conditions,. Its land uses, were determined to be
<br />the best fit for the area.
<br />The land uses, identified in scenario C were generalized into three categories: Residential,
<br />Commercial-office, and Commercial -retail. The desire was to determine an approximate
<br />cost per trip value. However, due to the location of the various, redevelopments,, not all
<br />trips, are created equal. Based on location, some trips, impact more inters,ections,/s,egments,
<br />than others,. Therefore, a cost per network trip was developed to account for the
<br />particular land use type and location.
<br />As future redevelopment opportunities, come forward their respective proportional
<br />contribution will be dependant on how many vehicular trips, they generate and how many
<br />network trips, they have based on their trip distribution. When trip generation estimates,
<br />exceed the as,s,umptions, used in this baseline analysis,, additional funds, may be collected.
<br />These funds, will go towards, the anticipated additional impacts, associated with the
<br />increased trip generation.
<br />Figure 19 on the following page presents, a summary of the year 2030 weekday p.m. peak hour
<br />cost allocation per network trip. Attachment C includes, two detailed matrices,, which display the
<br />percent breakdown by year 2030 background traffic, Northwestern College, and future Twin
<br />Lakes, redevelopment trip percentages,, as well as the related costs, for each improvement. These
<br />two matrices, are the background information used to develop the recommended cost per
<br />network trip.
<br />City of Roseville Twin Lakes AUAR Area
<br />February 2008, Infrastructure Improvements
<br />Page 6
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