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Quick Response Freight Manual: Final Report

Appendix E

Internal Versus External Truck Trips

The following table contains a summary of the percentages of internal versus external truck trips as a percentage of total commercial vehicle trips for various locations. Median and average values of external-external (through) trips have been calculated using the numbers shown in the Table.

E-1. Internal Versus External Truck Trips As Percentage of Total Commercial Vehicle Trips

Location Trip Type 6+ Tire Combination Unit Total Commercial Vehicles Date Notes/Comments
San Francisco Bay Area Internal-Internal (linked) 8.3% 50.0% 1993 See notes 1, 2, and 3.
Internal-Internal (garage-based) 5.3% 34.0% 1993 See notes 1, 2, and 3.
Internal-Internal (port) 1.3% 2.0% 1993 See notes 1, 2, and 3.
Internal-External 8.2% 14.0% 1993 See notes 1, 2, and 3.
Internal-External (Port) 0.0% 0.0% 1993 See notes 1, 2, and 3.
External-External (Through) 0.8% 1.0% 1993 See notes 1, 2, and 3.
Puget Sound Region Longhaul (>250 mi) space 9.5% 1994 See note 4.
Shorthaul (<250 mi) space 29.0% 1994 See note 4.
Local space 48.5% 1994 See note 4.
Through space 13.0% 1994 See note 4.
Lancaster County, Pennsylvania External-External (Through) space 50.0% 1994 See note 5.
External-Internal space 20.0% 1994 See note 5.
Internal-External space 30.0% 1994 See note 5.
York County, Pennsylvania External-External (Through) space 36.0% 1994 See note 5.
External-Internal space 43.0% 1994 See note 5.
Internal-External space 22.0% 1994 See note 5.
I-235, Polk County, Iowa Through space 11.0% 1991 See note 6.
Yuma Metropolitan Area, Arizona External-External (Through) space 7.0% 1990 See note 7.
Port Authority of New York and New Jersey (toll bridges/tunnel crossings) Through space 7.0% 1991 See note 8.
Average Through (External-External) Truck Trips 17.86% space space
Median Through (External-External) Truck Trips 11.00% space space
Minimum Through (External-External) Truck Trips 1.00% space space
Maximum Through (External-External) Truck Trips 50.00% space space
Notes:
1. Percentages based on number of trips.
2. Values available for 2-axle, 3-axle, and 4- or more-axle trucks. Assumed 4- or more-axle trucks = 6+ Combination Commercial Vehicles.
3. Schlappi, Marshall, and Itamura. "Truck Travel in the San Francisco Bay Area." Transportation Research Board 72nd Annual Meeting. January 1993.
4. Transmode Consultants, Inc. "Analysis of Freight Movements in the Puget Sound Region." Puget Sound Regional Council. October 1994.
5. Skelly and Loy, Inc. "PA 372 Origin-Destination Survey Final Report." For Lancaster and York County Planning Commissions. August 1994.
6. Wilbur Smith Associates. "I-235 Alternatives Analysis and Environmental Impact Statement," Technical Memorandum Number 1. For Iowa DOT.
7. Yuma Metropolitan Planning Organization. "1990 Origin-Destination Survey." 1990.
8. Percentage based on eastbound truck traffic at the region's 6 crossings.

For the San Francisco Bay Area data, internal-internal trips are subdivided into garage-based trips and linked trips. Garage-based trips are those trips where the truck travels from its origin to its destination and returns to its origin. Linked trips involve departure from the origin and travel to several destinations before returning to the point of origin. Internal-internal port trips are either garage-based trips or linked trips whose origin or destination is the Port of Oakland.