Overview

• Motoring advisers explain that most rear-view mirrors toggle to a dimmer, partially reflective surface via a small tab or button to reduce glare.
• A viral video highlighted the overlooked switch, revealing many drivers did not know it enables an anti‑glare setting.
• Newer cars often feature auto‑dimming mirrors that use sensors to darken the reflection when light from behind exceeds the light ahead.
• LED headlamps can appear brighter than older halogen bulbs, and higher lights on vans or lorries can intensify glare for following drivers.
• Safety guidance urges slowing or stopping if dazzled and notes that continuing with impaired vision can lead to careless driving penalties starting at £100 and rising to £5,000 in serious cases.