Highway 401 Widening - Highway 8 to Townline Road

[SammyOES]

Keep pace is bad in the context of zipper merge if it means you are lowering your speed in order to match with the 20th car back of the merge with no one in front of you. It's fine if it means you and the other lane are doing roughly the same speed, and both have roughly the same number of cars in front of you leading up to the merge.

Totally agreed.

Edit: I should add, zipper merge is also bad for small lines. If there's a line of less than say 15-20 cars on the highway its almost always better and safer to just join the end of the line.