The biggest snag with the highway 15 crossing is that it's where all the airport shuttle and tour buses cross. With 40 or more people on each one, they can take a while.
The Peace Arch crossing southbound gets messy from early afternoon on, after the trans-Atlantic flights show up at YVR around lunchtime. Last time I came through, at about 15:00 on a Friday afternoon in August of last year, it took four hours to get the 5 miles from the start of the line-up to being on the Washington side.
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.