Like it is in most of Europe? Miss an exit and you need to travel 5-10 km...
It wouldn't even be 5-10km if we're correcting the worst examples of it. On the Met start deleting exits and on-ramps in an alternating fashion between St-Laurent all the way to the 25. The biggest cause of traffic on the met/cremazie are cars trying to cut through 3 lanes to turn south-bound on any of the given major arteries, and then you have cars on cremazie trying to turn left across the cars from the off-ramp all in the space of 100m. All of this inevitably leads to traffic backing up on to the 40.