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James Lehnhoff, AICP City of Arden Hills Table 1 Existing Peak Hour Capacity Analysis Level of Service Results December 7, 2009 Page 5 Level of 5ervice Intersection A.M. Peak P.M. Peak LOS Delay �l� LOS Delay �1� County Road F and Hamline Avenue (Southbound} � B/F 90 sec. A/C 20 sec. . � : :::::::::::::: :::::::: ::: ::::::::: :::::::: :.::: : :: ; , . :; :::::::::: :::: :''': �� r.�n Count Road F and Hamline Avenue Northbound A/C 20 sec. : :;::;:::F�T::: ::: :..�►.. .. Y � ) County Road F and Boston Scientific West Driveway � A/B 10 sec. AB 10 sec. County Road F and Innovation Way * A/B 10 sec. A/C 1 S sec. County Road F and Lexington Avenue C 25 sec. D 40 sec. �1� For signalized intersections, delays shown represent overall intersection delay. For unsignalized intersections, delays shown represent the worst side-street approach. * Indicates an unsignalized intersection with side-street stop control. The overall LOS is shown followed by the worst approach LOS. Although the intersection of County Road F and Lexington Avenue currently operates at an overall acceptable LOS D, the westbound approach currently experiences average delays of approximately two and a half minutes during the p.m. peak hour. Typical queues on the westbound approach were observed in the field to consistently be 10 to 15 vehicles in length during the p.m. peak hour. The average and 95th percentile queue outputs from the micro- simulation model at this intersection are approximately 250 feet and 500 feet, respectively. The delays and queues at this intersection are caused by the conflict between westbound left-turning vehicles and eastbound through and right-turning vehicles. Further complicating the situation is the current geometrics at this intersection. The westbound geometrics include a shared left- turn/through lane and a shared through/right-turn lane. However, there is only one lane on the west approach to accept the two through lanes. This causes an unsafe condition and increased delays by creating an unnecessary conflict. To address the operational and safety issues previously mentioned, the following improvements are recommended: County Road F and Hamline Avenue • To lmprove the operations to an acceptable LOS, a traffic signal would need to be installed. However, the offset intersections between southbound and northbound Hamline Avenue pose significant challenges in the design of the signal and cannot address existing safety and geometric issues. Since there are no short-term cost effective improvements that will significantly improve operations, no improvements were assumed for build conditions. It should be noted that a long-term solution for the intersection was identified in the I-694: 35E to 35W Environmental Assessment dated July 200� and is included in the Appendix. The long-term solution will be discussed later in this memo.