Incidents are lane blockages or capacity reductions caused by disabled vehicles, road construction, etc. Incidents can be placed anywhere in the network and activated and cleared at any particular time. Each incident may affect one or multiple lanes. Incident data is read from a scenario definition file. The information for an incident includes: visibility, number of lanes affected, location (segment and longitudinal position). Lane specific information for an incident includes the severity of the incident and its length, maximum speed, start time, and expected duration. The maximum speed of an incident sets the upper bound on the speed of the vehicles passing by, which can be used to simulate the rubber-necking effect of partial blockage incidents. The start time of an incident may differ from the time that the incident is detected by the traffic management system. The clearance time of an incident is its start time plus duration by default, but it can be shortened by TMS to a time before the ``scheduled'' clearance time. This allows for evaluation of different incident detection and management schemes.