I was a member of the Construction Advisory Committee for the Sherbourne bike lanes a decade or so ago. Some of the bike lanes on Sherbourne/Lower Sherbourne are basically on the same level as the road, some are raised and there is a real curb. Ideally all would have been raised but the City only had $$ to do the raised ones where they were already reconstructing the road and/or moving catch basins. We supported creating a situation with a mixture so that it would be 'easy' to upgrade the level sections as opportunities arose and some have been improved since.