The idea of having shared bus-bike lanes has been raised in a number of cities, including Montreal. Not surprisingly, such lanes have tended to be unsatisfactory for both parties involved. People in busses do not like driving slowly behind cyclists. Cyclists do not like busses looming behind them.
What has not been tried, however (at least, as far as I can tell, according to Google) is a bus-bike time-share lane, in which busses get the lane when the weather is bad and cyclists get the lane when the weather is good. Such a lane might be a little bit tricky to sort out when the weather changes suddenly from good to bad (more on this in a moment), but in general it might work very well, since when the weather is bad most people do not want to ride their bikes much, whereas when the weather is good people are willing to wait longer at bus stops.
I imagine a bus-bike time-share lane working, perhaps, as follows:
- During the three winter months, no cyclists are allowed to use the lane: it is a bus-only lane
- During long heat waves, no cyclists are allowed to use the lane: it is a bus-only lane
- In spring, summer, and fall, busses can only use the lane when the weather is bad (say, below 5 degrees or above 25 degrees, maybe adjusted for humidity, smog, shade, wind, rain, ice, etc.)
- At times when the weather is intermediate (neither winter nor a long heat wave nor good weather), the lane works as a shared bus-bike lane. If, however, the weather gets very bad at such times (say, for e.g., above 30 and humid) busses can ring a special bell when there is a cyclist in front of them, forcing cyclists to pull over, stop, and let the bus pass.
- Cyclists can check an app to see if, at any given moment, busses are using the time-share lane
Of course, a lane of this kind would not be ideal. No time-share in the history of humankind has ever been considered ideal. Better would be for every main street to have a lane for transit and another separated lane for cycling. But that would mean scoring big victories against cars, and this does not seem likely to happen anytime soon in North American cities, most of which have large suburbs and a lot of very hot and/or cold weather.
For such cities, having a weather-dependent time-sharing bus-bike lane may not be ideal, but it could still be an ideal compromise.