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HGV and trailer MOT requirements: retrofitted blind spot information systems (BSIS)

8 Aug 2025

Blind spot information systems (BSIS) detect vulnerable road users and alert the driver to their presence or a possible collision.

They can be installed by the manufacturer or retrofitted at a later date.

If you’re retrofitting a BSIS device to an HGV with sideguards, you must install it in the right place. The vehicle will fail its MOT if the BSIS is in the wrong place.

Further information:

https://www.gov.uk/government/publications/hgv-and-trailer-mot-requirements-retrofitted-blind-spot-information-systems-bsis?utm_medium=email&utm_campaign=govuk-notifications-topic&utm_source=8f0099c9-8af2-449f-8ed5-23ef8fe08574&utm_content=immediately