Complaints about dazzling headlights have moved from anecdote to a measurable concern. Polling published by the College of Optometrists on 10 February 2026, supported by the RAC, found 57% of affected drivers say glare has worsened over the past 12 months; a quarter have reduced or stopped night driving, rising to 43% among those aged 75+. (college-optometrists.org)
Official casualty data do not show a recent spike. Department for Transport figures record 216 injury collisions in Great Britain in 2023 where ‘dazzling headlights’ was noted by police as a contributory factor, down from 330 in 2014. These counts are small in the context of total collisions but persistent year-on-year. (lordslibrary.parliament.uk)
From 2024, the DfT is replacing ‘contributory factors’ with a slimmer set of ‘road safety factors’ in the STATS19 system. The department has warned this creates breaks in time series and that detailed CF tables will be archived after 2023. Practically, ‘dazzling headlights’ no longer appears as a discrete, published item, complicating trend analysis and local benchmarking. (gov.uk)
Government-commissioned research from TRL provides new technical context. Using an instrumented car to capture luminance at driver eye height, TRL found a step-change in reported glare likelihood once scene luminance exceeded about 40,000 cd/m², indicating a threshold above which discomfort becomes much more likely. (trl.co.uk)
The same study associated increased glare with uphill approaches and right-hand bends-situations that place drivers’ eyes within the throw of oncoming headlamps. It also offered tentative indications that larger vehicles such as SUVs and models with LED headlamps may be more often associated with glare, while calling for further research to confirm vehicle-specific effects. (trl.co.uk)
International rules are tightening. The United Nations’ World Forum (WP.29) has adopted the 09 series of amendments to UN Regulation No. 48, making automatic headlamp levelling mandatory for new vehicle types from 1 September 2027 and for all types from September 2030, with a one‑year deferral for heavier categories. The aim is to reduce dazzle caused by load‑related pitch. (globalautoregs.com)
For the UK market, this matters because the UK is a contracting party to the UNECE 1958 Agreement and the Vehicle Certification Agency accepts UNECE approvals within the GB type‑approval scheme. In practice, most new models sold in Great Britain align with UNECE lighting requirements, so the 2027 auto‑levelling mandate should flow into GB approvals. (vehicle-certification-agency.gov.uk)
However, these changes affect new vehicles only. The existing fleet will remain on the road for years, and TRL’s analysis notes many instances of glare are linked to real‑world road geometry beyond the immediate reach of regulation-meaning driver behaviour, maintenance and enforcement still carry most of the short‑term impact. (trl.co.uk)
On enforcement, the MOT already checks headlamp aim. DVSA’s inspection manual requires testers to fail vehicles where halogen units on cars first used on or after 1 April 1986 have been converted to LED or HID bulbs, and to verify that levelling systems (where fitted) operate. Mis‑aimed lamps also lead to failure. (gov.uk)
DVSA tightened the headlamp aim standard in March 2016, introducing an explicit ‘dazzle zone’ check on the beam image. The change was designed to improve consistency of aim testing and to pick up patterns likely to cause discomfort for oncoming drivers. (mattersoftesting.blog.gov.uk)
Separately, ministers have confirmed that selling unapproved LED light sources for use in modern car, truck and bus headlamps is illegal under the Road Vehicles Lighting Regulations 1989, and that the MOT manual has been updated to reflect this-alongside wider work with the sector following rising public concern about glare. (questions-statements.parliament.uk)
Penalties are not trivial. Breaches of lighting requirements can result in prosecution and fines up to £1,000 for cars under the Road Traffic Offenders Act, with higher maxima for goods and passenger vehicles-alongside immediate MOT failure where defects are identified. (ukhaulagesolicitors.law)
For motorists, the near‑term actions are practical: ensure windscreens and spectacles are clean, keep lamps and automatic levelling systems in working order, and avoid fitting non‑approved light sources. The College of Optometrists also advises brief glances to the nearside verge when faced with bright oncoming lights, and regular vision checks. (college-optometrists.org)
What to watch through 2026–27: DfT’s transition to road safety factors will make national and local time‑series comparisons of ‘dazzle’ harder until RSF reporting beds in; TRL’s findings may inform future UK proposals at UNECE; and from September 2027, new models will need auto‑levelling-useful progress, but not a quick fix for today’s fleet. (gov.uk)