The cyclists complain about right-hooks on striped bike lanes, and they think barrier-separated lanes will be better? Sorry, the barriers will just make right hooks worse, by preventing cyclists from merging farther left in line with through traffic and preventing right turning drivers from merging right when approaching the turn.

In addition, the barriers will require cyclists to slow to a crawl at driveways and intersections and wait for the numerous drivers who will block them when preparing to pull out. If parking exists between the separated bikeway and the roadway, the cars will compromise sight lines between cyclists and traffic turning into side streets. Vehicles loading and unloading cargo from the parking area will extend ramps across the bikeway to the sidewalk. If the bikeway is two-way, expect much higher rates of car-bike collisions between right-turning drivers and the contra-flow cyclists compared to the crash rates for normal on-roadway cycling.

Barrier-separated bikeways are more hazardous than on-roadway cycling unless there are no intersections, such as on bridges or alongside freeways. Attempts to make them safer by signalizing all the junctions with a separate bicycle phase will delay all road users including cyclists by reducing everyone's green time. If a physically separate bikeway is desired, the bikeway should be in its own right of way (not a sidepath), with minimal junctions and/or with junctions treated like normal intersections with good sight lines and predictable traffic movements.