Microscopic Traffic Simulation Model
CORSIM includes both NETSIM (for surface street simulation) and FRESIM (for freeway simulation). Version 6 of CORSIM offers the following new features:
- Simulation Logic: CORSIM now offers improved simulation logic for lane changing, spillback checking, diagonal movements, complex intersection modeling, freeway acceleration lanes, deceleration lanes, ramp meters, car-following, origin-destination modeling, and setting goal lanes. An enhanced random number generator will produce better distributions, for improved stochastic modeling.Actuated controller parameters may now vary from time period to time period to simulate different time-of-day plans. The number of actuated controllers is now dynamic and limited only by the number of nodes in the network. Signal pre-emption and traffic assignment are now available for actuated signals.
- High Occupancy Toll (HOT) Lanes: CORSIM supports different HOT lane pricing algorithms, monetary value of time for each vehicle type, HOT pricing output data, and specification of vehicle types permitted to use HOT lanes in each time period. In addition, the user can specify a percentage of transponders for each vehicle type, and numerous calibration parameters to customize vehicle behaviors near HOT lanes. Sample input files for HOT lanes are automatically installed to the “TSIS Projects” folder.
- Advanced Toll Plazas: CORSIM now supports different types of toll payment in each lane, vehicle type restrictions in each lane, and the percentage of vehicles using each payment type. In addition, the toll plazas now allow all settings to vary between time periods, and numerous calibration parameters to customize vehicle behaviors near toll plazas. Sample input files for advanced toll plazas are automatically installed to the “TSIS Projects” folder.
- Two-Lane Rural Highways with Passing and No-Passing Zones: Added the ability to pass a vehicle by temporarily moving into the opposing traffic stream on a two-lane highway. Sample input files for two-lane highways are automatically installed to the “TSIS Projects” folder.
- Emergency Vehicles: Emergency vehicles (EV) can now be simulated, and can cause signal pre-emption if desired. EV sample data files and EV documentation are now included in the installation.
- Vehicle Type Origin-Destination (O-D) Volumes: Previous versions of CORSIM allowed vehicle type multipliers for standard off-ramp volumes, but automatically applied O-D volumes to all vehicle types. CORSIM now also offers specification of unique O-D volumes for each vehicle type. The original O-D inputs are still available for cases in which O-D volumes are the same for each vehicle type.
- Modeling Options:
- CORSIM can now simulate up to eleven through lanes in one direction on a mainline freeway link, i.e., 5 through lanes plus 6 full auxiliary lanes.
- The minimum desired free-flow speed on surface streets has been reduced to one mile per hour, to approximate vehicles dwelling in locations such as airport passenger pickup zones.
- Truck lane logic was modified to provide exclusive truck lanes in which non-truck vehicles are prohibited.
- Sign control can now be active in one time period and removed in the next time period, or vice versa.
- NETSIM can now simulate up to 9 lanes per intersection approach, up to 3 lanes per turn pocket, and turn pockets as long as 9999 feet.
- CORSIM and TRAFVU can now handle left-hand drive networks, with TSIS Next as the suggested input editor for using left-hand drive.
- CORSIM now allows the user to specify the percentage of advanced technology vehicles in the traffic stream, plus car-following time headways for each adaptive cruise control driver type.
- Auxiliary lanes can now be included on FRESIM interface links.