Improve roads! How??? (Cities in Motion 2)

Good!
Here is the section of the road, about 300 meters, it 4 routes, 4 metro stops. As this way to improve? To replace the other, leaving all the routes and buildings on it? She is 4 way, want to make 6 with two bus lanes! How the hell to do??? I'm sick to demolish it and rebuild with the alteration of routes and stops! I don't believe that the game has no such feature!