Traffic queues form when the traffic demand on a facility exceeds it capacity or the headway for the arriving vehicles is less than the time it takes to pass. When queues exist, the resultant form is delay, which is important measurement of road net's level of service.

Here are two examples of conducting queuing studies:

• Stop Sign Queue : The JAMAR counter is used for this type of study. It is set for 1 minute intervals on regular TMC mode, every time the box beeps a new interval record the number of vehicles in line. Multiple lanes need to counted separately.
  
• Signalized Queue Study : The JAMAR counter cannot be used for queuing study at signalized intersections. Every time the Signal turns green for the approach, we will record the time of signal change and record number of vehicles manually for each lane separately.
  

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