You’ve probably never seen a raised bike lane. They’re a new addition to bicycle friendly cities like San Francisco and Milwaukee. They’re typically the same width or a little wider than a traditional bike lane. They’re raised three to four inches above the traffic lane but are still several inches lower than the sidewalk. A bikeable gradient of three or four inches easily allows a rider to transition in and out of the bike lane. At the same time by creating a tactile surface they announce to motorist it’s a no vehicle space.
They have advantages for traffic planners since they create a separate lane without the need for space taking bollards or barriers. They have been shown to make riding safer and roads more efficient. They are growing in popularity. San Francisco is adding miles of them on very popular and heavily traveled streets in the downtown collider. Milwaukee is proposing almost five miles of them as well. Certainly they would be an asset in many larger Florida population centers.