Calibration objectives
In calibrating the model to accurately represent traffic conditions in the corridor, the AMS team's objectives are:
- Simulation of representative traffic volumes on the freeway and arterials for the time period considered
- Replication of bottlenecks on the freeway (location, speed, extent)
- Replication of observed queuing at intersections (observed approach speeds, location of queues, queue extent)
Calibration tiers
The AMS team is taking a tiered approach to calibration:
Detailed calibration of freeways
Reasonable calibration of key network arterials
Rough calibration of arterials at edge of network
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Calibration steps
Overall steps in the calibration process are:
- Recreate congestion using constant average demand for the simulation period.
- Adjust OD matrices based on observed data.
- Recreate congestion using demand profile(s) for each simulation period.
The process is applied in this way:
Preliminary calibration using a small area
Full network calibration based on results of the small calibration effort
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Further information on calibrating the model, including calibration guidelines, detailed steps, and examples, can be found in the AMS Phase 2 presentation.