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0�/26/98 THU 15:44 FAX 612 490 2150 SEH (� 002 <br />- <br />- <br />�� <br />MEMOf3ANDCl,M <br />■ ST. P�UL, MN ❑ MINNFJIPOUS, MN o ST. CLOUD, MN ❑ C!-11PPEWA FALL3, Wl G Mn0lSON, Wl R LAKE OOCIMY,IN <br />T0: Jim Erickson, City of Mounds View <br />FROM: Tom Sohrweide�� <br />DA7.'E: March 26, 1998 <br />ItE: G�eenwood Drive Traf�ic Diversion <br />SEH l�To. A-IVIOUND9845.00 <br />Steve Campbell has Porwazded your FAX to me regarding the tr�['ic diversi.ons on Greenwood Drive. <br />As C6air of the North Ceno�al Institute of Transportation Engineer's (NCITE) Neighborhood T,raffic <br />Control Committee, � have kept aware of various traffic calming techniques and have the followirtg <br />observations. <br />Cenerally, crearing a cu�vilinear alignment reduces traffic speeds. However, if it isn't doae abntpsly <br />enough, drivers can snaig�ten out the curves, thereby nunimizing the effect on their speed. Another <br />coneem wiuch I've seen iui many situations, is tha� whiie physical features, sucb, as curves may slovv <br />veh�icle speeds, camplaints and problems can continue as vehicles are driving too fast for conclitions. <br />While they may have been driving 3S mph pzeviously� a reconstructed alignment desims to slow <br />speeds to 20 mph, while they acNally drive it az 25 mph. This can result in vehicles crossing the <br />centerline or losing control. <br />Of the caro oprions, Option 1 combines two fe�atures. Roadway narrowing and curvilinear alignment. <br />The closer the pr�trusians are together, the more potential. co izz�paci speed. Caution needs ta be taken <br />to assure safe maintenance and emergency vehicle access. <br />Option 2 uses curvilineaz aligncnent only. Although this ean work, it creates greater o�portunity for <br />driv�rs to try and smooth out the curves and/or driva too fast for the new candition. <br />A recent MnDOT survey of inetxo a�ea traffic calming activity categories which included street <br />n�rrawing and horizontal reali�nment generally were reported ta result in unproved street safery. <br />if yau have any questions �elarive to the above ar desire aclditional informarion, please call me at 490- <br />207Z. <br />ts <br />c: Steve Campbell, SEH <br />9:1TRa,�J31MOUPID+[3AW D.R'PD <br />An AJff mwrive Aetio� <br />EAuel OPPcrrwiry F�nployer <br />