Canada

Where I live, that seems like a truly terrible idea.

Cyclists move really quickly and are somewhat reckless and selfish as they try to maintain their speed and momentum in traffic. It barely works with cars despite the dedicated lanes. It always causes problems anywhere that bike and pedestrian traffic meets, especially in areas n like temporarily diversion or construction.

I support bike lanes and, for quite a while, I use them extensively biking from the suburbs to my work downtown. I was probably the same.

We should not place slow-moving ( and vulnerable ) traffic in the path of cyclists. We do not need grandma or a paraplegic getting wiped out by a 180 pound guy going 25 km an hour.

You could try to make the bike lane massively wider. This would be a poor use of space. It would greatly increase congestion and the “slow alternative vehicle lane” would be almost empty all the time. It would be 30 empty wheelchair parking spots at the mall while cars get in accidents trying to find a spot but worse.

Of course, out of the city, things are different. My family enjoys a nice bike ride every Sunday on a local road that has quite a wide lane running side it that pedestrians, wheelchairs, scooters, and cyclists share. The lane is wide enough and traffic density is low enough. There are no buildings to move so, the “road” got wider with the extra lane rather than space for cars being reduced.