Case Studies
Across the world, various intervening ISA programmes have emerged as one of the most effective means to stop people from excessively and repeatedly speeding
Scroll down to explore the global impact of intervening ISA.
United Kingdom
In London, TfL’s operational evidence is already substantial. Its 2016 London bus report found that intervening ISA-equipped buses stayed within the speed limit 97% to 99% of the time, and TfL later reported a 62% reduction in speeding incidents across its own fleet vehicles.
TfL's 2024/25 delivery report states that 5,180 buses are now fitted with intervening intelligent speed assistance using GPS and geo-mapping to help the driver comply with the speed limit.
City of New York
New York City’s 2024 pilot, covering hundreds of city vehicles, found that 99.74% of total driving time within New York City was within the enforced speed threshold, that time spent severely speeding fell by 64.18%, and that hard-braking events fell by 36%. These results have shown that intervening speed control can reduce speeding markedly while still producing smoother, not harsher, driving outcomes.
District of Columbia and Washington State
The District of Columbia already requires enrolment in its DMV-run ISA programme for aggravated reckless driving offences as a condition of reinstatement. Virginia’s ISA law, which takes effect from July 2026, includes certification rules, indigency support and a specific tampering offence.
Washington State has also legislated for intervening ISA as a condition of restricted driving in certain reckless-driving and excessive-speed cases, with the legislature explicitly stating that technology can be used to keep people mobile while preventing continued unlawful speed.