Editing Speed limit (section)

===Compliance===
Speed limits are more likely to be complied with if drivers have an expectation that the speed limits will be consistently enforced.<ref>{{cite journal|last1=Bauernschuster|first1=Stefan|last2=Rekers|first2=Ramona|date=2022|title=Speed limit enforcement and road safety|url=https://www.sciencedirect.com/science/article/pii/S0047272722000652|journal=Journal of Public Economics|volume=210|page=104663|doi=10.1016/j.jpubeco.2022.104663|issn=0047-2727|hdl=10419/215026|hdl-access=free}}</ref>

To be effective and abided by, the speed limits need to be perceived as credible; they should be reasonable regarding factors such as how well the driver can see ahead and to the sides on a particular road.<ref name="racfoundation" /> Speed limits also need to conform to road infrastructure, education, and enforcement activity.<ref name="racfoundation" />

{{thumb|align=center|caption=Measure of effect of speed limit reduction from 90 km/h to 80 km/h, in July 2018, on the French network<br>(ONISR, 28 janvier 2019)<ref name="onisr.securite-routiere.interieur.gouv.fr">[http://www.onisr.securite-routiere.interieur.gouv.fr/contenus/sites/default/files/2019-02/2019%2B01%2B28%2BONISR-Cerema%2B1er%2Bbilan%2Bd%2B%C3%A9tape%2Bde%2Bla%2Bmesure%2BVMA80.pdf]{{dead link|date=December 2020}}</ref>
|content={{Graph:Chart
|type=line
|width=300
|x=June, July, August, September, October, November

|xAxisAngle=-40
|y3=,82.6,82.9,83.2,83.0,83.3
|y2=87.0,82.6
|y1=78.4,75.7,76.5,76.6,77.0,77.6
|y4=90,80,,,,80
|legend=
|vAnnotatonsLine=July
|vAnnotatonsLabel=Speed limit change
|y3Title=Car speed (80 km/h speed limit)
|y2Title=Car speed (90 km/h speed limit)
|y1Title=HGV speed (80 km/h speed limit)
|y4Title=Speed limit
|yAxisMin=70
|showValues=
|xGrid=1
|yGrid=1
}}
}}

In the UK, in 2017, the average free flow speed for each vehicle type is correlated with the applicable speed limit for that 
road type and for motorways and national speed limit single carriageway roads, the average free flow speed is below 
the designated speed limit for each vehicle type, except motorcycles on motorways.<ref>{{cite web|url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/743878/vehicle-speed-compliance-statistics-2017.pdf|title=Vehicle Speed Compliance Statistics|date=2017|website=assets.publishing.service.gov.uk|access-date=2020-12-29}}</ref>

{{thumb|align=center|caption=Average free flow speed in UK in 2017
|content={{Graph:Chart
|width=600
|type=rect
|x=motorway, rural single carriage, 30 mph streets, 20 mph streets
|y1=69,50,31,26
|y2=69,50,31,25
|y3=54,45,30,23
|y4=61,48,30,24
|y5=,47,29,21
|y6=,47,27,23
|y7=71,54,32,27
|hAnnotatonsLine=20,30,50,70
|hAnnotatonsLabel=20,30,50,70
|legend=
|y1Title=Cars
|y2Title=Light Commercial Vehicles
|y3Title=Articulated HGVs
|y4Title=Rigid HGVs
|y5Title=Short buses
|y6Title=Long buses
|y7Title=Motorcycles

|showValues=
}}
}}