Isn't it a bit more than just adding lanes? The project web page lists several parts to the project, and we don't know if the lanes will need the full period to be complete (as with the stages in North Vancouver):
- Widen Highway 1 to accommodate eastbound and westbound high occupancy vehicle (HOV) lanes in the median between the 216 Street and 264 Street Interchanges
- Construction of a new crossing at Glover Road, which will include dedicated 2.5-metre wide cycling lanes on either side and a separate two-metre wide sidewalk
- Reconfiguration of the existing 232 Street Interchange and the replacement of the existing crossing, including a three-metre wide multi-use pathway on either side
- Replacing the existing railway crossing immediately east of Glover Road
Also, as mentioned earlier in this discussion, the project calls for preloading in mid-2021; we don't know if that has started yet, and it can take quite some time to complete.