http://vision-traffic.ptvgroup.com/en-uk/products/ptv-vissim/ - This video shows some typical active traffic management (ATM) applications and their implementation in the microscopic traffic simulation software PTV Vissim.
With increasing traffic demand and the desire to keep traffic fluent and safe, especially on highly utilized freeways, ATM has gained more and more attention. The objective of ATM applications is to increase capacity, to maintain capacity at a high level and/or to encourage a more efficient usage of the existing infrastructure.
"Ramp Metering": The idea is to control the demand entering a freeway in such a way that traffic flow on the main lane does not collapse. Traffic lights are used to control the entry flow and the timing is set dynamically such that the traffic flow on the freeway stays just below capacity.
"Managed Lanes": Managed lanes are lanes dedicated to a sub group of all vehicles traveling on a freeway section. Typical sub groups are vehicles with a high occupancy (HOV -- High Occupancy Vehicle) and/or vehicles that pay to use the dedicated lane (HOT -- High Occupancy and Toll). By this method car pooling and public transport is encouraged and -- through traffic adaptive toll rates -- the level of service can be maintained on a high level.
"Variable Speed Control": Variable speed control, which can be generalized to corridor control, is used to harmonize individual vehicle speeds and control overtaking activity at times with high traffic volumes to keep traffic fluent. In addition, the variable message signs can also be used to warn drivers from possibly hazardous conditions (incidents, congestion, heavy rain, fog etc.).
"Temporary Use of Shoulder Lane": This application allows to open the hard shoulder temporarily in times of high traffic volumes to accommodate the traffic demand that would exceed the capacity provided by the regular lanes.
These simulations and animations were done using PTV Vissim.