You probably know and avoid it: the 60-year-old underpass between Rosemont–La-Petite-Patrie and the Plateau-Mont-Royal on avenue Christophe-Colomb, three wide lanes of car traffic, narrow sidewalks and a bike path smushed together in a long stretch of concrete and asphalt. It's ugly and it's dangerous. Montreal counted 95 collisions involving cyclists and pedestrians on Christoph-Colomb between 2018 and 2022. The city knows it sucks. So it's going to redo it.