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On topic...If you know the rules of the road it's pretty simple and no signage is needed. The lines on the road that indicate where and when to travel along a path. The painted area is a shared area.
Where the white lines are solid, the bicycle lanes and vehicles are demarcated as separate and neither operator should cross the line. Where the white lines becomes broken or dotted, cyclists or vehicles may change lanes - either for the purpose of cars going right while hugging the curb, or cyclists going around these turning cars, by cycling on their left to continue straight.
I'm downtown often and feel that overall, the roads are very clearly marked out if you know the rules of the road and how lane and sign markings are intended to be used. But I guess the point is that if neither cars nor cyclists know the rules of the road, it doesn't work as intended.
I agree that driver and cyclist education is paramount here and perhaps overhead signage would help.
I'll ride a motorcycle all day and night in downtown. I don't think I'll ever ride a bicycle on downtown roads again though with so many clueless and/or distracted operators.
Here's the video that was referenced in that piece above:
https://www.youtube.com/watch?time_continue=53&v=GbSI3MbL4ZY