Assignment Output Files ¶

Travel Model Two produces detailed assignment results showing how travel demand is loaded onto the transportation network infrastructure.

Highway Assignment Outputs ¶

Highway Network Files ¶

MAZ Preload Networks ¶

File Pattern: hwy/maz_preload_[TimePeriod].net

Description: Highway networks with MAZ-level demand loaded - Contains short local trips between MAZs - Shows local street utilization - Includes centroid connector flows

Final Assignment Networks ¶

File Pattern: hwy/load[TimePeriod].net

Description: Complete highway networks with all demand loaded

Key Link Attributes: - @auto_volume - Total auto volume - @auto_time - Congested travel time - @auto_cost - Generalized cost - @v_over_c - Volume over capacity ratio - @cspd - Congested speed - @delay - Delay compared to free-flow

Vehicle Type Volumes: - @vol_da - Drive alone volume - @vol_s2 - Shared 2-person volume - @vol_s3 - Shared 3+ person volume - @vol_sm - Small truck volume - @vol_hv - Heavy vehicle volume - @vol_tot - Total volume

Intermediate Networks ¶

File Patterns: - hwy/iter[X]loadEA.net - Assignment iteration networks - hwy/avgload[TimePeriod].net - Multi-iteration averaged networks

Highway Assignment Summary Files ¶

Volume-Delay Function Performance ¶

File Pattern: hwy/assign_summary_[TimePeriod].txt

Content: - Convergence statistics by iteration - Total vehicle-miles traveled (VMT) - Total vehicle-hours traveled (VHT)
- Average network speed - Relative gap convergence measures

Select Link Analysis ¶

File Pattern: hwy/selectlink_[analysis_name].txt

Description: Traffic volumes using specific highway facilities - Origin-destination patterns for selected links - Used for corridor analysis and impact assessment

Transit Assignment Outputs ¶

Transit Ridership Files ¶

Boardings by Line ¶

File Pattern: trn/boardings_by_line_[TimePeriod].txt

Format: CSV with columns:

line_id,line_name,mode,boardings,passenger_miles

Content: - Total boardings per transit line - Passenger-miles by line - Mode-specific ridership (bus, rail, etc.)

Boardings by Segment ¶

File Pattern: trn/boardings_by_segment_[TimePeriod].txt

Format: CSV with columns:

line_id,direction,stop_sequence,from_stop,to_stop,boardings,alightings,load

Content: - Segment-level ridership between stops - Directional passenger flows - Maximum load points identification

Transit Network Files ¶

Assigned Transit Networks ¶

File Pattern: trn/transit_assignment_[TimePeriod].net

Link Attributes: - @transit_boardings - Total boardings - @transit_volume - Passenger volume - @capacity_utilization - Load factor - @dwell_time - Station dwell time

Transit Line Attributes: - @line_ridership - Total line ridership - @headway - Service frequency - @capacity - Vehicle capacity

Advanced Transit Outputs ¶

Station-to-Station Flows ¶

File Pattern: trn/station_flows_[TimePeriod].csv

Description: Passenger flows between major transit stations Format:

origin_station,destination_station,passengers,avg_time,distance

Transfer Analysis ¶

File Pattern: trn/transfers_[TimePeriod].csv

Content: - Transfer volumes at major stations - Transfer walking times - Mode-to-mode transfer patterns

Transit Path Flows ¶

File Pattern: trn/path_flows_[TimePeriod].omx

Description: OMX matrices showing passenger flows by transit path and access mode

Congested Transit Outputs ¶

When congested transit assignment is enabled:

Capacity Constraint Summary ¶

File Pattern: trn/capacity_summary_[TimePeriod].txt

Content: - Lines/segments operating at capacity - Passenger denial statistics
- Crowding penalties applied

Reliability Impacts ¶

File Pattern: trn/reliability_[TimePeriod].csv

Content: - Schedule adherence impacts - Passenger delay due to crowding - Service reliability metrics

Network Performance Summaries ¶

System Performance Report ¶

File Pattern: output_summaries/network_performance_[TimePeriod].csv

Highway Metrics: - Total VMT by facility type - Average speeds by area type - Congestion duration and extent - Level of service distribution

Transit Metrics: - Total transit ridership - Average load factors - Service miles and hours - Passenger-miles per revenue-mile

Screenline Analysis ¶

File Pattern: output_summaries/screenlines_[TimePeriod].csv

Content: - Traffic volumes crossing defined screenlines - Mode split across major barriers - Directional flow patterns - Comparison with count data

Corridor Performance ¶

File Pattern: output_summaries/corridors_[TimePeriod].csv

Content: - Travel times along major corridors
- Volume and speed by corridor segment - Parallel route usage patterns

Quality Assurance Outputs ¶

Assignment Convergence ¶

File Pattern: logs/assignment_convergence_[TimePeriod].log

Content: - Relative gap by iteration - Maximum link volume changes - Convergence criteria achievement

Network Validation ¶

File Pattern: output_summaries/network_validation.csv

Content: - Comparison with traffic counts - Speed validation against floating car data - Transit ridership vs. operator data - Geographic distribution accuracy

File Formats and Usage ¶

Network Files (.net) ¶

Software: Emme transportation planning software
Content: Node/link topology with attributes
Size: 50-200 MB per time period

OMX Files (.omx) ¶

Software: OpenMatrix library (Python, R, Java)
Content: Origin-destination matrices
Compression: Built-in HDF5 compression

Text/CSV Files ¶

Software: Any spreadsheet or statistical package
Encoding: UTF-8
Delimiters: Comma or tab-separated

Processing Notes ¶

Time Periods: All files generated for 5 time periods (EA, AM, MD, PM, EV)
Iterations: Assignment typically converges in 10-25 iterations
File Retention: Intermediate files may be cleaned up automatically
Coordinate System: California State Plane Zone III
Units: Miles, hours, passengers, vehicles