# The Road Vehicles (Authorisation of Special Types) (General) Order 2003, Paragraph 21

Extent: E+W+S

(1) When a mobile crane is used on roads, the beacon fitted to it under paragraph 14 must be kept lit—
(a) when the crane is stationary at the site of the operations at which it is to be used; or
(b) when the crane is unable, on account of the weather conditions or otherwise, to maintain speeds appropriate to the road.
(2) But, in the circumstances described in sub-paragraph (1)(a), the beacon may be switched off if—
(a) there is no reasonable prospect of the presence of the mobile crane causing a hazard to persons using the road (so that it is not necessary or desirable to warn persons of its presence); or
(b) it is likely that the use of the beacon could confuse or mislead other road users.

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Source: https://www.legislation.gov.uk/uksi/2003/1998/schedule/2/paragraph/21 (the official version)
Page: https://openlegislation.uk/road-vehicles-authorisation-of-special-types-general-order-2003/schedule-2/paragraph-21
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.