# The Bus Lanes (Approved Devices) (England) Order 2005, Paragraph 4


The equipment is—
(a) synchronised with the “Rugby” atomic clock or another independent national standard clock; and
(b) accurate within plus or minus 10 seconds over a 14-day period and is re-synchronised at least once during that period.

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Source: https://www.legislation.gov.uk/uksi/2005/2756/schedule/paragraph/4 (the official version)
Page: https://openlegislation.uk/bus-lanes-approved-devices-england-order-2005/schedule/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.