New statistics show that during 2018, 87% of cars exceeded the speed limit on roads with a 20mph limit – with 22% breaking the limit by more than 10mph.
The DfT statistics measure speed and compliance at sites where the road conditions are ‘free flowing’ – for example roads with no junctions, hills, sharp bends, speed enforcement cameras or other traffic calming measures.
However, the DfT acknowledges that free flowing conditions are not typical of most 20mph roads and as a result, must be ‘interpreted with additional caution’.
Levels of compliance on other road types
Single carriageway roads where the national speed limit applies (60 mph) had the highest levels of compliance, with only 10% of cars exceeding the limit. However, this figure represents a 1% rise on 2017 when only 9% exceeded the limit.
On motorways, 46% of cars exceeded the 70mph speed limit, with 11% exceeding it by more than 10mph. These figures show a year-on-year fall; compared to 48% and 12% respectively in 2017.
On 30mph roads, 52% of cars exceeded the speed limit with 5% exceeding it by 10mph or more – 1% fewer than in 2016.
The DfT says the figures are not representative of the level of speeding across the whole road network – which it would ‘expect to be lower’.