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The total length of the path is 443.6 miles and takes an estimated 36 hours to complete by bike. Just under half (47.4%) of the route consists in traffic-free paths.
London to Reading
The route roughly follows the course of the River Thames between London and Reading, and forms a junction with NCR 5 and NCR 23 at the latter.
At its east end, the route meanders mostly set about one "block" back from the Thames, including several small parks. It shortcuts through: Rotherhithe and mid-Pimlico. It finds the Thames at the Chelsea Embankment. It zig-zags through Hurlingham and Barnes Common.
Much longer, the Reading to Bath section follows the Kennet & Avon Cycle Route which partly follows the towpath of the Kennet and Avon Canal and the course of the River Kennet, with other sections on low-traffic roads.
Approaching Bath, Route 24 and the Two Tunnels Greenway are a corollary, rejoining Route 4 west of the city centre.
The Bath to Bristol section of the route follows the Bristol & Bath Railway Path, a dedicated cycle path on a disused railway line. This is entirely traffic-free. "Bristol and Bath Railway Path". Sustrans. Retrieved 5 July 2022. Its 13 miles are completely traffic-free and almost entirely flat