In Australia the bike lanes are provided for cyclists to ride in.......but they can
legally ride outside of it, to their own peril, of course. I used to ride close to the line, but after being run over by a car I try to ride in the middle of the bike lane. One major reason roadies stay near the line is that broken glass, tree debri, nails, wire etc etc gathers in the bike lane and with expensive tyres we try to avoid constant punctures. Maybe if local authorities did their job properly and swept these lanes on a weekly basis then cyclists would be happy to ride away from the line.