rnorris

Where around "Lake Sammamish" are you starting from? Since you're estimating a roughly 5 mile commute each way in a northwesterly direction to the 405/520 interchange, I'm guessing you're starting somewhere in south Bellevue, north of I-90. This is a good area for bike commuting, particularly south of NE 8th St. where a lot of the area is residential and there are some good arterials that aren't too busy. It gets a little trickier north of NE 8th St. where the area is a lot more urban. I would avoid taking 116th or 124th north of NE 8th to get to the 520/405 junction, they're doable on a bike but very unpleasant- extremely busy 4 lane arterials with no shoulders, and no one's looking for bikes or pedestrians. I would cross 405 in downtown Bellevue and ride north to the 520 junction on 112th Ave NE, which is busy but not quite as bad.