1600 121ST ST SE 2016-01-01 MF Import

The majority of t.he intersections studied aze signalized. Th.e level of services shown for these intersections are baeed upon critical volume analysis and the volume to capacity ratio ior the intersection as a whole. Analysis of the unsiqnalized intersections assumed an average runninq speed of equal to the posted speed limit. Critical qaps were reduced by 0.5 seconds for all movements to accc•int for the area population exceeding 250,000, as permitted in the H.C.M. The LOS qiven for unsiqnalized intersections are for the movement with the lowest reserve capacity. Mitiqations qiven in the key to footnotes are intended to improve the LOS to 'D' or better where possible. The specific mitigations are discussed further in the next section. •• -�- : .�• �• - in the study area there are seven locations where deletezious impacts in terms of p.m. peak hour levels of service will occur as a result of traffic volume increases due to background growth together With growth caused by implementation of the adjacent projects in the area. These are at the 1 e.E. Street S.E. intersection where a LOS 'E' will exist in 1995, at the 19th Avenue S.E./1_16�h Street S.E. intersection where a I.OS 'F' wiZl exist in 1995, at the 19th Avenue S.E./112th Street S.E. intersection where a LOS 'E' currentZ y exis s falling to 'F' in 1995, at the 112th Street S.E./7th_Avenue S.E. intersection where a LOS �'fi� wi1T exist in 1995, at the 19th Avenue S.E./100th Street S.E. intersection where a LOS '� will exisf in 1995, the 19th Avenue S.E,/E1 Capitan Way intersection where LOS 'F' will exist in 1995 and the S.R. 526/Broadway Avenue where a LOS 'F' presently exists and will continue to exist in 1995. it is important to note that these level of service deficiencies will exist regardless development of the "Casper Creek" project. Traffic generated by "Casper Creek" will simply exacerbate these already deficient levels of service. At the 121st Street S.E./19th Avenue S.E. intersection aidening of 19th Avenue S.E. to five lanes and signalization of the intersection vould improve the 1995 p.m. peak hour LOS f.:om an 'F' without improvements to an 'A'. The siqr,al system should be a mast arm type with fully actuated three phase operation. At the 116th Street S.E./19th Avenue S.E. intersection the addition of another north and southbound through lane would EXHlllt � � -11- 1.�.�_ UE� i^�� Chnatopher Bros�n �r Aaaociates ��' ' ^ Si9 Rainier .i��enue N.. Swle .1 ?01 �, � Renlon. WA 98055•1380 ,� �� (206) ;;:-ll88 _�`