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<br />. <br /> <br />e <br /> <br />Mr. Carl Ohm <br />Mr. Jon Olson <br />August 8, 1994 <br />Page 8 <br /> <br />. Screenlines at the Mississippi River bridges <br />19) TH 169 Bridge <br />20) TH 610 Bridge <br /> <br />In order to reflect the future tr~ffic volumes in the study area more <br />realistically, the plus or minus difference between the 1990 ground and 1990 <br />modeled volumes were used to adjust the Year 2015 modeled volumes. In <br />most cases, as can be seen in Table 1, the 1990 ground and 1990 modeled <br />volumes are similar. <br /> <br />A final adjustment was made to Year 2005 and Year 2015 traffic volumes <br />crossing the TH 169 bridge. Original modeled volumes reflected a number of <br />vehicles that could not be accommodated by the existing or the future design <br />of the TH 169 bridge. This problem is a common occurrence in modeling <br />where many roadways come together at one or two points for a bridge <br />crossing. The adjustment was made by completing a select link analysis on the <br />TH 169 bridge and redistributing traffic based on the results of that analysis. <br />The analysis showed that 33 percent of traffic on the TH 169 bridge could be <br />redistributed, to either the TH 101 bridge to the northwest or the TH 610 <br />bridge to the southeast. Of that 33 percent, 61 percent are projected to use the <br />TH 610 bridge, and the remaining 39 percent are projected to use the TH 101 <br />bridge. Finally, traffic volumes from the TH 169 bridge were added or <br />subtracted on affected roadways. The results of the redistribution of TH 169 <br />bridge traffic volumes present a more realistic view of travel behavior within <br />the study area. <br /> <br />Development of PM Design Hour Directional Traffic Volumes <br /> <br />Historical traffic volume data from Anoka County and the Minnesota <br />Department of Transportation was used in developing PM design hour <br />directional volumes at the above-listed screenline locations. The factors used <br />for calculating ADT volumes to PM design hour directional volumes are listed <br />below. <br /> <br />1) TH 169 -- 15.2% design hour factor (DHF), 65% westbound - 35% <br />eastbound <br />2) TH 47 -- 9.77% DHF, 30% southbound - 70% northbound <br />3) 7th Avenue -- 8.66% DHF, 55% southbound - 45% northbound <br />