The maximum speed limit on a road outside a built‑up area, unless a different limit is shown by signs, is 60 mph for cars and motorcycles on a standard single‑carriageway road in the UK.

National speed limit outside built‑up areas

  • On single carriageway roads (no physical central divider), the national speed limit for cars and motorcycles is 60 mph.
  • On dual carriageways and motorways (with a central reservation), the national speed limit for cars and motorcycles is 70 mph, again unless signed otherwise.
  • These are the general limits; some vehicles (like vans, buses, and heavy goods vehicles) have lower maximums on the same roads.

Built‑up vs non–built‑up

  • A built‑up area is normally indicated by street lighting and a default limit of 30 mph (20 mph in many parts of Wales, and some signed zones in England and Scotland).
  • Once you leave a built‑up area and see a national speed limit sign (white circle with a black diagonal stripe), you should assume:
    • 60 mph on single carriageways.
    • 70 mph on dual carriageways and motorways, unless signs say otherwise.

Quick reference table

[3][5] [1][9] [9][1]
Road type (cars & motorcycles) Default maximum speed
Built‑up area (street lights, no other signs) 30 mph in England, Scotland, Northern Ireland; 20 mph in most of Wales unless signed otherwise
Single carriageway outside built‑up area 60 mph, unless a lower limit is signed
Dual carriageway outside built‑up area 70 mph, unless a lower limit is signed

Important cautions

  • The posted signs always override the default national speed limit.
  • The limit is a maximum , not a target; you must drive slower if conditions (weather, traffic, visibility, road layout) make it unsafe to travel at that speed.
  • Different vehicle classes (towing, vans, buses, HGVs) often have lower maximums on the same stretch of road, so drivers of those vehicles should check their specific rules.

Information gathered from public forums or data available on the internet and portrayed here.