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<p>The Department for Transport has not issued guidance on additional equipment fitted
to heavy goods vehicles (HGVs), although officials are actively participating in work
commissioned by Transport for London (TfL) to develop an independent methodology for
performance and evaluation criteria for the effectiveness of such equipment. TfL is
aiming for the methodology to be validated and available in the Autumn.</p><p> </p><p>Prior
to entry into service, new heavy goods vehicles (HGVs) already require approval of
mirrors, including their field of view and correct attachment to the vehicle. Information
on these requirements is publicly available.</p><p> </p>
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