Editing Speedometer (section)

===United Kingdom===
[[File:Ford Mondeo MK3 ST220 - Speedometer (light).jpg|thumb|A speedometer showing mph and km/h along with an [[odometer]] and a separate "trip" odometer (both showing distance traveled in miles)]]

The amended Road Vehicles (Construction and Use) Regulations 1986 permits the use of speedometers that meet either the requirements of EC Council Directive 75/443 (as amended by Directive 97/39) or UNECE Regulation 39.<ref>{{cite web |
url= https://publications.parliament.uk/pa/ld200001/ldhansrd/vo010312/text/10312w01.htm |title=Speedometer Accuracy | work=Written Answers, Hansard (UK Parliament proceedings) Monday, 12th March 2001 |access-date=7 January 2008}}</ref>

The Motor Vehicles (Approval) Regulations 2001<ref>{{cite web |url= http://www.opsi.gov.uk/si/si2001/20010025.htm#sch3 |title=The Motor Vehicles (Approval) Regulations 2001: Schedule 3 |work=Office of Public Sector Information |access-date=19 December 2007}}</ref> permits single vehicles to be approved. As with the UNECE regulation and the EC Directives, the speedometer must never show an indicated speed less than the actual speed. However, it differs slightly from them in specifying that for all actual speeds between 25&nbsp;mph and 70&nbsp;mph (or the vehicles' maximum speed if it is lower than this), the indicated speed must not exceed 110% of the actual speed, plus 6.25&nbsp;mph.

For example, if the vehicle is actually traveling at 50&nbsp;mph, the speedometer must not show more than 61.25&nbsp;mph or less than 50&nbsp;mph.