# The Bus Lanes (Approved Devices) (Scotland) Order 2011, Paragraph 3


The device and visual counter must—
(a) be synchronised with a suitably independent national standard clock; and
(b) be accurate within plus or minus 10 seconds over a 14-day period and re-synchronised to the suitably independent national standard clock at least once during that period.

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Source: https://www.legislation.gov.uk/ssi/2011/444/schedule/paragraph/3 (the official version)
Page: https://openlegislation.uk/bus-lanes-approved-devices-scotland-order-2011/schedule/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.