That sounds like a terrible design. Or rather, a reasonable design implemented poorly. I don’t have a problem with double bike lanes, but they have to be sign

That sounds like a terrible design. Or rather, a reasonable design implemented poorly. I don’t have a problem with double bike lanes, but they have to be signed properly for the reasons you mention. And they should be continuous - forcing one direction to periodically divert onto sidewalks is bonkers. After seeing some of the designs of bike lanes, sidewalks, etc in my area, I’m convinced the traffic engineers are either 100% incompetent or they’re all anti-bike/pro-car. State funding requires bike infrastructure when major roadworks are planned, but it doesn’t appear to require bike infrastructure that makes any sense.