Over the railway line, with the A40 in the background
The B411 is a short B-road in Bayswater, west London.
It starts on the A404 Harrow Road, at a set of traffic lights half buried under the A40 Westway. The road heads south, immediately crossing the Great Western Main Line before going along Porchester Road to reach the A4206, which it crosses using traffic lights. The road heads south along Inverness Terrace to end on the A402 on the edge of Kensington Gardens.
However, Inverness Terrace is one-way southbound. Northbound traffic leaves the A402 one block west and heads north along Queensway (which is one-way northbound) to reach the A4206. Some maps show the northern extension of Queensway via the Porchester Hall to reach Porchester Road; other maps require northbound traffic to multiplex one block east along the A4206.
In 1922 the B411 only existed north of the A4206. The extension south (along Queensway) was added later.