Heading westbound, the blue cycle track is intermittent, sharing its space with the pedestrian footpath.

This continues for around 500 metres before the blue, two-way track returns as a constant feature running in parallel with the A13, separated from the main carriageway by a kerb.

After crossing Barking Creek, C3 branches southwards so as to avoid clashing with traffic at the busy junction between the A13, the A406/North Circular and A1020.

Having passed beneath the A1020/Royal Docks Road, C3 continues to run parallel to the A13 (Newham Way), segregated from traffic on the main carriageway.

Continuing westbound, C3 follows Limehouse Causeway and Narrow Street, briefly running parallel to the River Thames.

At the end of Victoria Embankment, C3 heads westbound on Bridge Street, again as a wide, segregated cycle track, passing Parliament Square on its northernmost edge.

C3 then passes several government offices as it continues westbound, running along the entire length of Birdcage Walk (the southern boundary of St. James's Park).

C3 then heads briefly north, passing Buckingham Palace, before continuing westbound again on Constitution Hill as a segregated bike freeway.

CS3 was one of the original twelve "motorways of cycling," and was designed to take cyclists along the route it currently occupies from Barking to Lancaster Gate.

[12] Johnson dubbed this central section of the route a "Crossrail for cyclists," hoping to create a "cleaner, safer, greener city.