Construction is in its final stages for the new Port Mann bridge and its December opening.

The Cape Horn interchange is changing dramatically.

Officials have this to say to commuters: expect big changes this month as the final pieces are put together for the Cape Horn interchange.

It's the busiest, if not most complicated interchange in BC, going from four overpasses to 15.

The traffic patterns will change in phases in mid-September, such as shifting three lanes of Highway One from the old to the new Port Mann.

You'll actually be able to drive on the new bridge after that.

Then they'll be reduced to one lane in the final weeks so crews can demolish the old overpass and make final additions.

Eight of ten lanes of the new Port Mann bridge are set to open in December, with a three dollar toll.