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====Radar detection====
Radars are mounted on the side of the road to measure traffic flow and for stopped and stranded vehicle detection purposes. Like video systems, radar learns its environment during set up so can distinguish between vehicles and other objects. It can also operate in conditions of low visibility.
Traffic flow radar uses a "side-fire" technique to look across all traffic lanes in a narrow band to count the number of passing vehicles and estimate traffic density.
For stopped vehicle detection (SVD) and automatic incident detection, 360-degree radar systems are used as they scan all lanes along large stretches of road. Radar is reported to have better performance over longer ranges than other technologies.<ref name="Ogier">{{cite web |title=Comparison of Stopped Vehicle Detection (SVD) Technologies for Smart Motorway Applications |url=http://ogierelectronics.com/comparison-of-svd-technology.php |website=Ogier Electronics |access-date=4 May 2020}}</ref> SVD radar will be installed on all [[Smart motorway]]s in the UK.<ref>{{Cite web|url=https://www.gov.uk/government/publications/smart-motorway-evidence-stocktake-and-action-plan|title=Smart motorway evidence stocktake and action plan|website=GOV.UK|language=en|access-date=2020-04-12}}</ref>