# The Road Vehicles (Construction and Use) Regulations 1986, Paragraph 7

Extent: E+W+S

In this Part of this Schedule—
(a) a reference to the lambda value, in relation to a vehicle at any particular time, is a reference to the ratio by mass of air to petrol vapour in the mixture entering the combustion chambers divided by 14.7; and
(b) “the emissions publication” is the publication entitled “In Service Exhaust Emission Standards for Road Vehicles – Nineteenth edition” (ISBN 978-1-84864-176-1) published by the Department for Transport.

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Source: https://www.legislation.gov.uk/uksi/1986/1078/schedule/7B/paragraph/7 (the official version)
Page: https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-7B/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.