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MEASURING IMPROVEMENTS IN THE MOVEMENT OF - page 28 / 60

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Measuring Improvements in the Movement of Highway and Intermodal Freight

or standard for designating such roads, e.g., a disproportionately high percentage of combination trucks in the traffic mix or some special significance of a corridor because of the high levels of freight movement in it.

Data

Data from the Highway Performance Monitoring System (HPMS) may be used to designate freight-significant highways. The HPMS contains data on traffic volumes and the percent of vehicles that are combination trucks in the vehicle mix. One could determine which HPMS segments have high truck traffic flows and use these to designate freight-significant highways.  

Once the freight-significant highways are identified, the data issues are straightforward for travel time and delay but actual gathering of data would require on-site observations. For the stretches of highway designated (which could be 50 miles or 500 miles), it would be necessary to make arrangements for direct measurements, e.g., with license plate readers. Data on incidents on the relevant segments would have to be gathered on a systematic basis and matched with observed delay in some fashion.  All of these direct observations would require special arrangements with State and local governments and significant resources would likely be required.

Scores: Point-to-point travel times for freight-significant highways

Descriptive value

2

Technical appropriateness

3

Data availability

Not easy

Data cost

Medium to high

Scores: Hours of delay per 1000 vehicle-miles on freight-significant highways

Descriptive value

2

Technical appropriateness

3

Data availability

Not easy

Data cost

Medium to high

Scores: Hours of incident-based delay on freight-significant highways

Descriptive value

2

Technical appropriateness

3

Data availability

Not easy

Data cost

High

Ratio of Peak-Period Travel Time to Off-Peak Travel Time at Freight-Significant Nodes

28

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