The northbound I-5 has a 4 mile stretch from Everett to Marysville with 3 lanes with frequent poor lane discipline. Left and middle lane hogging, leaving large gaps of unused lanes despite need to carry very large traffic volumes. Inconsiderate and shame. Beware if left lane hog finally decides to go to middle lane some 50 yards after the crest of the Snohomish river bridge, because it could be 2 motorcycles camping in the left side breakdown lane, hugging the concrete divider median. Depending on the size of hogging car in front, it could block the view up to 1/2 mile ahead when it matters the most. Nasty surprise when motorcycles are revealed into full view head on, just when you are getting ready to pass the slower vehicle after patiently waiting behind it. Observed 9:30 am weekdays when it is sunny weather.