159th St. between I-35 and Old 56 Highway, will be closed to thru traffic both east and west directions due to a total reconstruction, according to the City of Olathe’s website.  Detours are scheduled to utilize both Lone Elm Rd. and Old 56 Hwy for the duration of the project which will take approximately two years.
Currently traffic on 56Hwy is “looped” around ongoing construction on 56 Hwy between Gardner and Olathe.