PD-17-00001 Marian Meadows Full Record with Index (2)

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Marian Meadows Rezone and Subdivision Final Environmental Impact Statement 3-53 What is functional classification? Functional classification is the division of roadways into groups having similar characteristics of providing mobility and land access. Public agencies define functional classifications differently, but, in general, arterials provide the most mobility and least direct property access, collectors provide an approximate balance between mobility and direct property access, and local roads emphasize direct property access in lieu of mobility. What is ADT used for? Transportation planners use existing and projected average daily traffic (ADT) to evaluate the consistency between the roadway’s design and use. A roadway with an ADT that is higher than the functional classification standards indicates improvements may be needed. 3 What roadways currently serve the area? The study area is served by several roadways with different functional classifications and uses. Functional classifications are described differently depending on which public agency owns and maintains the roadway. These roadways are shown in Figure 3-8 and include:  I-90 is Washington’s primary east-west interstate and is classified by WSDOT as a Rural-Interstate (R5) within the study area. This section of I-90 has two lanes in each direction and the posted speed limit is 70 miles per hour (mph). The average daily traffic (ADT) is approximately 27,000 vehicles per day (vpd) (2006 count).  Railroad Street is classified by Kittitas County as a Rural Local Access (class 9) road and provides access between I- 90 from Exit 70, the town of Easton, and the project site (via Sparks Road). This roadway has one lane in each direction and the posted speed limit is 35 mph. South of the I-90 Exit 70 eastbound ramps, the ADT is approximately 550 vpd (2008 count).  Sparks Road is classified by Kittitas County as a Rural Local Access (class 9) road and serves as the primary route to I-90 (via Railroad Street) for traffic on the north side of I- 90 with one lane of travel for each direction. The posted speed limit is 35 mph and the ADT is approximately 250 vpd west of Railroad Street and 1,250 vpd east of Railroad Street (2008 count).  Pit Way/Hawthorn Lane is not classified by Kittitas County with respect to functional classification. This two- lane roadway provides residential access and connects to Sparks Road with a posted speed limit of 15 mph. The ADT is roughly 75 vpd (estimated from 2006 and 2008 counts).