Agenda - Parks and Recreation Commission - 01/12/1995

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I I I I I I I I I I I I I Mr. Carl Ohm Mr. Jon Olson August 8, 1994 ~age 8 Screerdines at the Mississippi River bridges 19) TH 169 Bridge 20) TH 610 Bridge ~ order to reflect the future traffic volumes in the stud), area more realistically, the plus or rrdnus difference between the 1990 ground and 1990 modeled volumes were used to adjust the Year 2015 modeled volumes. In most cases, as can be seen in Table 1, the 1990 ground and 1990 modeled vblumes are similar. k final adjustment was made to Year 2005 and Year 2015 traffic volumes c~ossing the TH 169 bridge. Orig4~nal modeled volumes reflected a number of v~kicles that could not be accommodated by the existLng or the future design of the TH 169 bridge. This problem is a common occurrence in modeling w~ere many roadways come together at one or two poLnts for a bridge crossing. The adjustment was made by completing a select 1Ln.k analysis on the TbI 169 bridge and redistributing ~affic based on the results of that analysis. T~e analysis showed that 33 percent of traffic on the TH 169 bridge could be re~tistributed, to either the TH 101 bridge to the northwest or the TH 610 bSdge to the southeast. Of that 33 percent, 61 percent are projected to use the TPI 610 bridge, and the remaining 39 percent a_re projected to use the TH 101 bridge. Finally, traffic volumes from the TH 169 bridge were added or stlbtracted on affected roadways. The results of the redistribution of TH 169 br_idge traffic volumes present a more realistic view of travel behavior within the study area. Development of PM Design Hour Directional Traffic Volumes Historical traffic volume data from Amoka Count3, and the Minnesota Dqpartment of Transportation was used in developing PM desig'n hour di~ect-ional volumes at the above-listed screenline locations. The factors used fo~ calculating ADT volumes to PM desiv~n hour directional volumes are listed below. TH 169 -- 15.2% desi~ hour factor (DHF), 65% westbound - 35% eastbound 2) TH 47 -- 9.77% DHF, 30% southbound - 70% northbound 3i 7th Avenue-- 8.66% DHF, 55% southbound - a=°'~o ~o northbound