What Is The Width Of A Road In The Uk? A Comprehensive Guide

Understanding the Width of a 2-Lane Road in the UK

When it comes to the width of a standard 2-lane road in the UK, it’s essential to consider specific specifications. In the context of standard motorways, which typically handle an annual average daily traffic (AADT) of around 52,000 vehicles, there is a road type known as the all-purpose dual carriageway (D2AP). This type of road shares many similarities with motorways in terms of key dimensions.

In particular, an all-purpose dual carriageway (D2AP) in the UK features a carriageway width of approximately 7 meters, equivalent to 23 feet. This width is essential for accommodating two lanes of traffic moving in opposite directions. Additionally, there is a hard shoulder alongside the carriageway, which has a width of approximately 2.5 meters, equivalent to 8 feet and 2 inches. The hard shoulder serves as a safety buffer and emergency lane for vehicles in case of breakdowns or emergencies.

In summary, a 2-lane road in the UK, specifically the all-purpose dual carriageway (D2AP) with specifications resembling those of a motorway, has a carriageway width of 7 meters and a hard shoulder width of 2.5 meters. These dimensions are crucial for maintaining safe and efficient traffic flow on this type of roadway.

The minimum width of a two-way road in the UK depends on the type of traffic it accommodates. For standard traffic, which includes buses and heavy goods vehicles (HGVs), the unobstructed width should be a minimum of 6.75 meters. In cases where the road is restricted to cars and light vehicles only, the minimum width is reduced to 5.5 meters.

When it comes to shuttle working, where narrower lanes may be acceptable, a desirable width range is between 3.25 to 3.50 meters, with an absolute minimum of 3.0 meters. In cases where space is very limited, a desirable minimum width of 3.25 meters is recommended, with an absolute minimum of 2.5 meters. This ensures safe and efficient traffic flow on the road, taking into account different types of vehicles and traffic conditions.

What is the minimum width required for a one-way road in the UK? One-way streets must have a carriageway that is at least 3.7 meters wide. This width is narrower compared to a standard lane on a two-way road. This regulation ensures safe and efficient traffic flow on one-way streets. Keep in mind that as of October 21, 2022, the minimum width remains at 3.7 meters.

Unobstructed widths

	Standard: Normal traffic including buses and HGVs	Restricted: Cars and light vehicles only
Two-way working	6.75 m minimum	5.5 m minimum
Shuttle working	3.25–3.50 m desirable width range 3.0 m absolute minimum	3.25 m desirable minimum width 2.5 m absolute minimum