Editing Traffic congestion (section)

===Traffic management===
[[File:SES Staumelder A5.JPG|thumb|Traffic congestion detector in Germany]]
Use of so-called [[intelligent transportation system]]s, which guide traffic:
* [[Traffic reporting]], via radio, [[Global Positioning System|GPS]] and [[Car App|mobile apps]], to advise road users
* [[Variable message sign]]s installed along the roadway, to advise road users<ref>{{cite web|url=http://sior.ub.edu/jspui/cris/socialimpact/socialimpact00438|title=Reducing delay due to traffic congestion|website=Social Impact Open Repository|access-date=September 5, 2017|archive-date=September 5, 2017|archive-url=https://web.archive.org/web/20170905144020/http://sior.ub.edu/jspui/cris/socialimpact/socialimpact00438|url-status=live}}</ref>
* [[Automotive navigation system|Navigation systems]], possibly linked up to automatic traffic reporting
* [[Traffic counter]]s permanently installed, to provide real-time traffic counts
* [[Automated highway system]]s, a future idea which could reduce the safe interval between cars (required for braking in emergencies) and increase highway capacity by as much as 100% while increasing travel speeds{{Citation needed|date=September 2007}}
* [[Parking guidance and information]] systems providing dynamic advice to motorists about free parking
* [[Active traffic management]]<ref name="ha6months">{{cite web|url=http://www.dft.gov.uk/pgr/roads/tpm/m42activetrafficmanagement/ATM6MonthSummaryResultsforP1.pdf  |archive-url=http://webarchive.nationalarchives.gov.uk/20080306113842/http://www.dft.gov.uk/pgr/roads/tpm/m42activetrafficmanagement/ATM6MonthSummaryResultsforP1.pdf  |url-status=dead  |archive-date=March 6, 2008  |publisher=Department for Transport |author=Highways Agency |title=M42 Active Traffic Management Results – First Six Months |date=October 25, 2007|access-date=December 31, 2007}}</ref> system opens up UK motorway [[hard shoulder]] as an extra traffic lane; it uses CCTV and VMS to control and monitor the traffic's use of the extra lane.