Guidance

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

Examples of where blind spot information system (BSIS) devices can be retrofitted on different types of HGV to meet MOT requirements.

• From: Driver and Vehicle Standards Agency
• Published: 29 July 2025

Applies to England, Scotland and Wales

Documents

Where you can retrofit blind spot information systems (BSIS) on heavy goods vehicles (HGVs)

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Details

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.

Published 29 July 2025