Most drivers remain unaware of Highway Code changes one year after they were introduced.
The Highway Code, which contains advice and rules for people using Britain's roads, was amended on January 29 last year to provide more protection for vulnerable road users.
It stated that motorists should leave a gap of at least 1.5 metres when driving at up to 30mph, with a wider gap at higher speeds.
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Other changes included advice to cyclists to ride in the centre of lanes on quieter roads, in slower-moving traffic and when approaching junctions, and the creation of a hierarchy of road users meaning someone driving has more responsibility to watch out for people cycling, walking or riding a horse.
But a quarter (25%) of the 2,168 British adults surveyed earlier this month for Cycling UK said they knew "nothing at all" about the amendments, and just 30% of respondents who drive at least once a week and had some awareness of the update could correctly identify the overtaking guidance.
A similar poll conducted immediately after the new Highway Code was published indicated that only 33% of regular drivers who knew about the changes gave the right response on the overtaking gap.
Cycling UK said the figures demonstrate the Government has failed to properly communicate the changes.
It described the "short-lived" publicity drive by road safety body Think! as "a good first step" but called for a "sustained well-funded awareness campaign of at least three years" to change "entrenched driving behaviour".
A Department for Transport spokesman said: "The changes to the Highway Code aim to improve safety for people cycling, walking and horse riding, and we invested over £1.3 million in our Think! campaign which has increased awareness and understanding of the changes over the last year.
"We have worked closely with a group of stakeholders representing all road users to develop the campaign, with many also supporting the campaign on their own channels."
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