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CHAPTER 4 TRANSPORTATION 66 The primary purpose of the metropolitan travel forecasts is to get a picture of regional travel and particularly traffic volumes on the metropolitan system of intermediate and principal arterials. The level of confidence of the predicted volumes on these routes is expected to be high. However, the accuracy of the predicted traffic.volumes on New Brighton's minor arterials and collector streets was questionable without further refinements. The process used in refining the metro projection can be summarized as follows. The total traffic on New Brighton streets and highways can be thought of as comprised of three basic types; through traffic, interzonal traffic and intrazonal traffic. THROUGH TRAFFIC Through traffic is that traffic which passes through New Brighton non-stop. This portion of the total future traffic was determined by subtracting the metropolitan trip assignments of the four TAZ's comprising New Brighton from the metropolitan area travel forecasts. The resulting through traffic volumes represent trips of fairly long distances and, therefore, should be quite accurate. Some adjusting and redistribution of traffic between parallel routes was made on the basis of existing traffic counts and observed travel patterns. INTERZONAL TRAFFIC f Interzonal traffic is basically traffic between the four TAZ's comprising New Brighton and outside areas. Also included, however, would be a small percent of traffic between the four TAZ's within the City. This interzonal traffic was determined by subdividing the four TAZ's comprising New Brighton into thirty-six smaller and more homogeneous subzones. The amount of traffic which would be generated by each of the subzones was then determined based on the City's land use plan and assuming saturation development. The estimated year 2000 population, housing and employment are the factors used to estimate traffic generation. This information by subzone is tabulated on Figure 4 and the resulting number of daily vehicle trips are listed on Figure 5. Subzone estimates in total, exceed the total estimated housing and population shown in the Housing Section. This is because we attempted to illustrate a "Worst possible case" situation in each subzone to see if traffic problems would develop in that sub-area. The same intensity of development will not occur community-wide, so the population and housing estimates of the Housing Section are a more accurate reflection of the likely total development of the community. TAZ Number of Intrazonal Vehicle Trips 892 1,116 893 2,446 894 615 895 44