When traffic grinds to a halt, rail is the only thing that moves at a normal pace, because it has dedicated right-of-way. You can create bus lanes. But if you

When traffic grinds to a halt, rail is the only thing that moves at a normal pace, because it has dedicated right-of-way. You can create bus lanes. But if you're talking about "going out to the suburbs", then eventually you're going to get stuck in the same traffic as everyone else. You still have to compete for the same intersections, and you're probably going to end up in places that don't have dedicated bus lanes.