Editing Gridlock (section)

==Alleviating gridlock==
To make a traffic system less susceptible to gridlock, a traffic metering system can be introduced. These systems determine the optimal number of vehicles allowed in a traffic system, and prevent any extra vehicles from entering. This can be done with traffic control devices, such as [[traffic lights]] or warning signs, or a better public transportation system. This type of system is used in [[Zurich, Switzerland]].<ref>{{cite journal | last1 = Daganzo | first1 = Carlos F. | year = 2007 | title = Urban gridlock: Macroscopic modeling and mitigation approaches | journal = Transportation Research Part B: Methodological | volume = 41 | issue = 1| pages = 49–62 | doi = 10.1016/j.trb.2006.03.001 | bibcode = 2007TRPB...41...49D }}</ref>