Variable speed limits would be really helpful for managing the whiteouts that hit the 401 and 402 between Sarnia/Windsor and London. Every time it happens there’s pretty much a guarantee that there’s going to be a massive multi-vehicle pileup due to the speeds that the average person drives on those stretches despite being in bad weather.You're talking 400-series, as well as a few others, right? There are all sorts of King's Highways that don't have merge/exit lanes, but do have lots of at-grade intersections, private driveways, etc.
I'd really like them to trial it somewhere. There is a stretch of Quebec 20 that is prone to heavy fog rolling in from the river that has it. There are a number of spots that are prone to snow squalls where it might help. One problem would be the transient nature of the squall. Fog rolls in, but whiteouts can be come and gone in a blink. I don't know how flexible or sensitive the technology is.