|The carriageway is subjected to active traffic management which controls lanes and speed limits in real time.|
|Used on these elements|
|Tools for this tag|
active_traffic_management is used to show if a carriageway is subjected to active traffic management such as speed limits and lane closures in real time in response to congestion or incidents. This tag is almost always used in conjunction with maxspeed:variable=*, however just because a road is subjected to variable speed limits doesn't mean it is actively managed.
proposed:active_traffic_management and construction:active_traffic_management can be used for roads where active traffic management is being proposed or is under construction.
In the United Kingdom smart motorway have been rolled out which include regular variable message signs showing motorists of mandatory speed limits, lane closures and traffic information. Most of the new smart motorways since 2015 have been of the "All Lane Running" variation whereby the Hardshoulder becomes a running lane along with other works to gain additional space from the central reserve and Emergency Refuge Areas (highway=emergency_bay) provided at regular intervals to accommodate broken down vehicles.
On smart motorways the following tags are recommended in additional to standard tags that would be found on a motorway.
|active_traffic_management=yes||The road is subjected to Active Travel Management then set as yes.|
|maxspeed:variable=yes||If the road is subjected to mandatory speed limits (uses roundels) then set as yes. There usually are signs saying "Start of Variable Speed Limit" and "End of Variable Speed Limit" beside the road or slip road.|
|shoulder=*||If the road doesn't have an Hard Shoulder due to width constrictions at bridges or because the road was widened using an "All Lanes Running" upgrade. Then set shoulder to no. It is presumed that motorways do have a shoulder if not set|
Infrastructure associated with smart motorways can also be added.
|man_made=gantry||Gantries suspended above the carriageway can be drawn as a way and tagged as a gantry.|
|traffic_sign=variable_message||Signs or displays that show speed limits (mandatory or advisory) as well as traffic information can be tagged as this. If the sign or display is attached to a gantry then it should be a node on the gantry way.|
|variable_message:model=*||The model of variable message sign can also be specified. In the United Kingdom there are 5 main VMSs used.
|highway=emergency_bay||On All Lane Running Smart Motorways, where there is an emergency refuge area provided, an emergency bay should be added at the centre point's node on the highway way.|
|emergency=phone||On All Lane Running Smart Motorways, an emergency phone is provided at all ERAs, this should be tagged on its own node in it's location. Where there is a hard shoulder, emergency phones should be tagged in the same way.|