5.8. SR 02-22-2005 - Laserfiche WebLink

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Mr. Dan Clumpner -5- December 7, 2004 EXISTING CONDITIONS The site for the proposed develqpmentpresently is undeveloped. Northofthe site is Main Street, a four lanermidwaywith a median between Carson Street andTH 169. Carson Street provides access for the development on the north side of Main Street. To the east, Main Street intersects with TH 169, a four lane highway with a median. Existing geometries and traffic controls at the subject intersections are as follows: . r; . Main Street/TH 169. This intersection presently provides two left turn ,lanes, two through lanes, and one right turn lane on all approaches. This intersection presently is controlled by a traffic signal. Although this traffic signal is' setup for coordinated operation with other nearby signalized intersections on TH 169, this signal presently is operating uncoordinated. Mn/DOT (Minnesota Department of Transportation) staff has indicated that problems arose due to changes made to this intersection about two years ago. One of the major problems is insufficient space within the intersection for northbound double left turns and the southbound double left turns to operate at the same time. This led Mn/DOT staffto provide lead phasing for northbound left turns -and lag phasing for southbound left turns. With this change in phasing, the existing controller was unable to provide coordination. MnIDOT currently is in the process of evaluating alternative signal timing/phasing plans and controllers to develop a plan that provides coordinated operation for this signal. MnIDOT's expectation is to develop and implement such a plan by the end of2004. . Main Street/Carson Street. This intersection presently provides a left turn lane ,and a through lane on the west approach, a left turn lane, a through lane, and a shared through/right turn lane on the east approach, and one left turn lane and one right turn lane on the north approach. Although the north approach presently is not marked as two lanes, observations at the site indicated that this approach is wide enough for two lanes and motorists were using it as a two-lane approach. This intersection pr'esently is controlled by a stop sign on the north approach. To better understand existing conditions at the subject intersections, traffic volumes were collected at these intersections on a typical weekday in January during both the a.m. (7:00 - 9:00 a.m.) and the p.m. (4:00 - 6:00 p.m.) peak periods. To account for average conditions during a year, our counts were increased by nine percent, which was based on MnlDOT's seasonal adjustment factors. Existing traffic volumes during both the a.m. and the p.m. peak hours are presented. later in this memorandum.