Closures are expected on I-405, with some reports indicating they will occur from April 27 to May 2, while others suggest closures will take place on different dates, including weekends in April and overnight closures in June. The closures may affect both northbound and southbound lanes, as well as ramps, in various locations, including the Sepulveda Pass and areas near Renton, Bellevue, and Kirkland. The closures are likely to cause traffic disruptions, but the exact dates and locations of the closures are not consistent across reports.