 News Radio Traffic from the High Performance Homes Traffic Center. In the Sea-Tac area on southbound I-5 between South 200th and South 272nd Street, up to three lanes are closed overnight until 6 a.m. for construction work. And west of Tiger Mountain, eastbound Highway 18 between Issaquah-Hobart Road and Raging River, the roadway is closed for road repairs until about 4 a.m. I'm Jay Phillips, Northwest News Radio.