I used to live in Pointe Claire (a west island community) and would almost always use the 540/40 route onto the island from the west - even though my house was closer to the 20. The 20 is a pain due to the extra traffic lights that you encounter. I was through that area on the 20 last November and it had not changed since I lived there - I was wishing I took the 40 like I used to.
The route that vince492 shared (20-540-40-25-20) looks better than the 20/Pont Champlain route. Its been a while, but I've been stuck in traffic on that bridge more times that I care to remember. The suggestion is partly based on the fact that the 25 corsses south way past the downtown core. Take it with a grain of salt - I lived on the west island and neve actually used the 25 much.
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