The thing which I think would really help with bike lanes would be to standardize on placing underground utilities beneath them --- they'd be less expensive to dig up than a roadway structured for cars, and when maintenance is necessary, a cyclist can easily be diverted either onto the roadway (if staying on the bike) or to the sidewalk (if temporarily dismounting).

The width of a bike lane and its margins is not nearly enough space to safely trench deep enough with the equipment they already have to reach most things they need to tear roads up for. Even modest water mains can be 4ft in diameter, drainage and sewage twice that (in flood prone areas)