We will be leaving Vancouver at 3:30pm on a Thursday for a 10pm flight. Knowing that we will be hitting Seattle at the peak of rush hour is there an alternate route that can be recommended to avoid it or are we best to just sit it out? There will be 4 of us so any car pool lanes may apply? Any maps or online route planning doesn't outline things like car pool lanes so I thought it best to ask the locals. Also I am used to the drive taking less than 4 hrs, do you think it could take more than that?