Commercial Vehicle Output Files ¶

Travel Model Two generates comprehensive commercial vehicle (truck) demand matrices and analysis outputs for freight and service vehicle movements.

Truck Demand Matrices ¶

Trip Generation Results ¶

File Pattern: demand_matrices/commercial/truck_generation_[truck_class].csv

Description: Trip productions and attractions by MAZ for each truck class

Truck Classes: 1. Very Small Trucks (2-axle, 4-tire) - Service vehicles, small delivery 2. Small Trucks (2-axle, 6-tire) - Medium delivery, service trucks
3. Medium Trucks (3-axle) - Large delivery, construction vehicles 4. Large Trucks (4+ axle) - Heavy freight, combination vehicles

Format: CSV with columns:

MAZ,productions,attractions,balanced_productions,balanced_attractions

Content: - Raw model-generated trip ends - Balanced productions and attractions - Balancing factors applied

Trip Distribution Results ¶

File Pattern: demand_matrices/commercial/truck_od_[truck_class]_[time_period].omx

Description: Origin-destination trip tables by truck class and time period

Matrix Names: - TRIPS - Total daily trips - AM_TRIPS - AM peak period trips
- PM_TRIPS - PM peak period trips - OFFPEAK_TRIPS - Off-peak period trips

Commercial Vehicle Summary ¶

File Pattern: output_summaries/commercial_vehicle_summary.csv

Content: - Total trips by truck class - Average trip length by class - VMT by truck type and area type - Temporal distribution patterns

Trip Generation Analysis ¶

Employment-Based Generation ¶

File Pattern: output_summaries/truck_generation_by_employment.csv

Description: Trip generation rates by employment sector

Employment Categories: - RETEMPN - Retail employment - FPSEMPN - Food/personal services - HEREMPN - Health/education/recreation
- OTHEMPN - Other employment - AGREMPN - Agriculture/natural resources - MWTEMPN - Manufacturing/wholesale/transportation

Trip Rates: Trips per employee by truck class and employment type

Household-Based Generation ¶

File Pattern: output_summaries/truck_generation_by_households.csv

Description: Service vehicle trips generated by residential areas

Content: - Household service vehicle rates - Delivery and service trip patterns - Residential area commercial activity

Trip Distribution Analysis ¶

Friction Factors ¶

File Pattern: commercial/friction_factors_[truck_class].csv

Description: Distance-based impedance factors used in gravity model

Format: CSV with columns:

distance_bin,friction_factor,calibrated_factor

K-Factors Application ¶

File Pattern: commercial/k_factors_applied_[truck_class].csv

Description: Spatial adjustment factors applied to base trip distribution

Content: - Origin zone k-factors - Destination zone k-factors
- Adjustment ratios by geography

Blended Impedance ¶

File Pattern: commercial/blended_impedance_[truck_class].omx

Description: Combined time and distance impedance matrices

Components: - Travel time impedance - Distance impedance
- Blending parameters by truck class

Temporal Distribution ¶

Time-of-Day Factors ¶

File Pattern: commercial/time_of_day_factors.csv

Description: Factors for distributing daily trips to time periods

Format: CSV with columns:

truck_class,EA,AM,MD,PM,EV

Content: - Share of daily trips by time period - Different patterns by truck class - Peak/off-peak distribution

Directional Factors ¶

File Pattern: commercial/directional_factors.csv

Description: AM/PM directional split factors

Content: - Morning peak direction preference - Evening peak direction preference - Varies by truck class and trip purpose

Special Generators ¶

Airport Freight ¶

File Pattern: commercial/airport_freight_[airport].csv

Description: Freight trips to/from airport facilities

Airports Included: - SFO - San Francisco International - OAK - Oakland International - SJC - San Jose International

Content: - Air cargo truck trips - Ground service equipment - Passenger service vehicles

Port Freight ¶

File Pattern: commercial/port_freight_[port].csv

Description: Freight movements to/from port facilities

Ports Included: - Oakland Port - Richmond Port - Redwood City Port

Content: - Container truck movements - Bulk cargo vehicles - Port service traffic

Industrial Facilities ¶

File Pattern: commercial/industrial_generators.csv

Description: Major industrial facility freight patterns

Facility Types: - Refineries - Manufacturing plants - Distribution centers - Construction sites

External Commercial Vehicles ¶

External-Internal Trips ¶

File Pattern: commercial/external_internal_trucks.omx

Description: Commercial vehicle trips crossing model boundary

External Stations: 21 external gateway locations

Content: - Through trips by truck class - Internal-external trips - External-internal trips - Growth rates by forecast year

Through Trips ¶

File Pattern: commercial/through_trucks.omx

Description: Commercial vehicles passing through region

Content: - External-external movements - Truck class distribution - Route assignment impacts

Model Calibration Outputs ¶

Observed vs. Modeled Comparison ¶

File Pattern: output_summaries/truck_calibration_summary.csv

Content: - Truck count validation - Classification accuracy - Temporal pattern validation - Geographic distribution checks

Calibration Adjustments ¶

File Pattern: commercial/calibration_adjustments.csv

Description: Parameters adjusted during model calibration

Content: - Trip rate adjustments - Friction factor modifications - K-factor calibration values - Temporal distribution adjustments

Network Assignment Results ¶

Truck Volumes by Link ¶

Included in: hwy/load[TimePeriod].net

Link Attributes: - @vol_sm - Small truck volume (classes 1-2) - @vol_hv - Heavy vehicle volume (classes 3-4)
- @pct_truck - Truck percentage of total volume

Truck VMT Summary ¶

File Pattern: output_summaries/truck_vmt_[time_period].csv

Content: - VMT by truck class and facility type - Network performance impacts - Freight corridor utilization - Truck speed and delay

Data Processing Notes ¶

Trip Purpose Segmentation ¶

Service Trips: Household-serving commercial vehicles
Freight Trips: Goods movement between businesses
Construction: Temporary construction-related trips
Waste/Utility: Service utility and waste collection

Geographic Detail ¶

Generation: MAZ-level (40,000+ zones)
Distribution: TAZ-level (1,454 zones)
Assignment: Full network detail

Temporal Resolution ¶

Daily: 24-hour period
Peak Periods: AM (6-10), PM (3-7)
Off-Peak: EA, MD, EV periods

Model Integration ¶

Feedback: Truck volumes affect highway congestion
Land Use: Employment-based trip generation
External: Coordination with regional freight forecasts

Quality Assurance ¶

Validation Targets ¶

Total Truck VMT: Regional truck VMT targets
Truck Counts: Validation against classification counts
Temporal Patterns: Peak/off-peak distribution validation
Facility Type: Truck usage by highway functional class
Geographic Distribution: Truck activity by county/area

Key Performance Indicators ¶

Truck percentage of total traffic
Average trip length by truck class
Freight activity per employee
External truck trip validation
Seasonal variation factors