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The sentence "SR 510 roughly parallels the Nisqually River, the border between Thurston and Pierce counties, between the Fort Lewis and Nisqually Indian Community area to Yelm; five educational institutions, including one community college and two high schools, are served by the route." needs to be split at the semicolon.
"The highway travels south through the Hawks Prairie Village Mall", change "through" to "by" as I doubt the road actually runs through the mall.
The sentence "After intersecting Mudd Run Road, future roundabout and western terminus of the Yelm Loop,[11] the roadway enters Yelm city limits, turns southeast, becomes Yelm Avenue and serves Yelm High School." is confusing and wordy.
The sentence "Shortly thereafter, the roadway serves Yelm Middle School,[13] crosses the Yelm-Tenino Trail, a 7.4-mile (11.9 km) long rail trail in operation since 1993,[14] and ends at First Street, signed as SR 507 and SR 507 continues southeast as Yelm Avenue" needs to be broken up at the point of the first mention of SR 507.
I had added a "Future" section, describing an interchange project that has not, as of this date, started. It also, therefore, has not completed. Thus, the project is in the future, not in History. --Chaswmsday (talk) 22:57, 6 October 2018 (UTC)[reply]