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Intermodal Freight Congestion

 

The TRAC seeks to target investment toward mitigation the existing intermodal freight capacity constraints, using a congestion scales that is analogous with roadway volume-to-capacity ratio. Just as roads have a capacity based on speed limits, type of roadway, and number of lanes, water and rail facilities have similar capacity measures.  Congestion ratio can be calculated for intermodal facilities based on the volume of freight they carry or lists made compared with their capacity.

Road​ Port​ Railroad​ Intermodal
Volume Inputs​

Traffic Volume:

  • Autos
  • Trucks
  • Peak Hour Factor​

Port Volume:

  • Break Bulk Tons
  • Containers (TEUs)
  • Dry Bulk Tons
  • Liquid Bulk Gallons​

Train Traffic Expressed As:

  • Number of Railcars
  • Number of Trains
  • Train Length​

Terminal throughput:

  • Containers (TEUs)
  • Other Transfer Measures (e.g. Rail/barge, rail/truck)​
Capacity Inputs​
  • Type of Road
  • Number of Lanes
  • Speed Limit
  • Terrain
  • % Truck Traffic
  • etc.​
Per hour or per diem capacity expressed in tons, TEUs, etc.​

Per hour or per day capacity (expressed in railcars, trains, etc.) as controlled by:

  • Number of Tracks
  • Signalization
  • At Grade Crossings​
Per hour or per day transfer capacity, for example containers per day.​

 

 

Range​ ​ Points​
0​ 0.54​ 0​
0.55​ 0.59​ 1​
0.60​ 0.65​ 2​
0.65​ 0.69​ 3​
0.70​ 0.74​ 4​
0.75​ 0.79​ 5​
0.80​ 0.84​ 6​
0.85​ 0.89​ 7​
0.90​ 0.94​ 8​
0.95​ 0.99​ 9​
1.00+​ ​ 10