# The Mines (Control of Ground Movement) Regulations 1999, Paragraph 12


In the case of roadways where persons work or pass in front of the last permanent support–
(a) temporary supports shall be used; and
(b) the maximum distance between the last permanent support and the first line of temporary supports shall be 1.2 metres, except where props are used, when that distance shall be 0.9 metres.

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Source: https://www.legislation.gov.uk/uksi/1999/2463/schedule/paragraph/12 (the official version)
Page: https://openlegislation.uk/mines-control-of-ground-movement-regulations-1999/schedule/paragraph-12
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.