At little more than the length of a single bicycle, the £2,000 road marking has left cyclists in Cardiff bemused.
The feature, thought to be the shortest cycle lane in Britain, has been installed to encourage green transport.
Cardiff Council claims that it will help riders safely navigate a turn on a new road layout.
But riders in the city say the brevity of the red and white marked stretch of road renders it pointless.
Kevin Hughes, 47, a cyclist from the Welsh city, said: "It's just hilarious. I saw it as I was cycling past and couldn't believe my eyes.
Obviously nobody could cycle in it because it is so small. You just have time to get in the saddle before getting off again."