The M48 is a small motorway that replaced the M4 over the Severn Bridge when the Second Severn Crossing was built. It starts and ends at the M4.
| Motorways | |
|---|---|
| Single-digit motorways: | M1 • M2 • M3 • M4 • M5 • M6 • M8 • M9 |
| Two-digit motorways | M10 • M11 • M18 • M20 • M23 • M25 • M26 • M27 • M32 • M40 • M42 • M45 • M48 • M49 • M50 • M53 • M54 • M55 • M56 • M57 • M58
M60 • M61 • M62 • M65 • M66 • M67 • M69 • M73 • M74 • M77 • M80 • M90 |
| Three-digit motorways | M180 • M181 • M271 • M275 • M602 • M606 • M621 • M876 • M898 |
| Converted A-roads | A1(M) • A3(M) • A38(M) • A48(M) • A57(M) • A58(M) • A64(M) • A66(M) • A74(M) • A167(M) • A194(M) • A308(M) |