[area_man_2]

I cannot speak to east of Seattle but for significant portions it is grade separated.

Of the 3 stops where it isn't, it has it's own lane on a major thoroughfare and only chances an errant driver crossing an intersection.

Now for the Seattle Streetcars, those are a different story. For the most part, they have a dedicated lane so they breeze past traffic, but could get caught if traffic is especially bad.