When we last left off, our bicycling adventure had just taken us past a bus that was pulling away from the curb. Here you can see another use for the bike lanes - cab hailing areas.
This brings the popular use of bike lanes options up to 4.
1) Riding some form of a bicycle
2) Getting on and off buses
3) Getting into and out of cabs
4) Parking
But getting back to the subject at hand...
While cabbies sometimes use their turn signals, watching the faces of their passengers is a very useful prediction tool. When the passenger in the cab driving next to you starts looking frantic and apparently pointing directly at you, it is a good bet that the vehicle will probably be lurching towards the curb relatively soon.
One nice thing is that most backseat doors in a cab are not able to open on the driver side, so bicycle riders only need to worry about the cabbie jumping out and not the passengers themselves.
This is only true if you are passing on the left side of the cab of course.