Developing Measures of Effectiveness for Truck Weight Enforcement Activities Final Report (1998) / Chapter Skim
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APPENDIX B Development, Evaluation, and Ranking of M.O.E.s
APPENDIX B Development, Evaluation, and Ranking of M.O.E.s
Pages 109-128
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From page 109... ...
to assist the safe operation of trucks and other vehicles in the vicinity of trucks. Goals of state enforcement agencies that operate truck weight enforcement activities are the following: to deter truck operation in an overweight condition and/or operating with inappropriate axle-spacing, to control pavement and bridge damage from overweight trucks, 3.
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From page 110... ...
An area-w~de weight enforcement program involves monitoring trucks using a network of activities such as those listed above. A program is more comprehensive and considers applied procedures, operating schedules, required enforcement staff, type of road where deployed, route arid diversion routes where enforcement is deployed, and other char actenstics.
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From page 111... ...
The basis of Mr. Cottrell's measures development input is his ~ 5 years of experience in traffic engineenng research which includes specific research addressing He development of a truck weight sampling pearl using the Tragic Monitoring Guide.
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From page 112... ...
Canclidate M.O.E. Evaluation and Ranking Procedures The initial list of developed candidate M.O.E.s considered a variety of applications; i.e., effectiveness determinations for truck weight enforcement site-specific activities, corndor enforcement, and program application.
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F Sensitivity to infrastructure damage One objective of truck weight enforcement is to control pavement and bridge damage from overweight trucks.
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was guided by two pnnciples. First, derived measures should be consistent with capabilities of potential data sources, e.g., commercially available WIM equipment and SHRP LTPP data output.
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Trucks in Sample - The fraction (or percentage) of the truck sample exceeding the applicable weight limit based on any of the parameters listed below, based on a statistically valid sample size.
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Commercially available WIM equipment is commonly applied in statewide sampling procedures.
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C Supports Statewide Ranclom Sampling Ranlcing: 4 Significantly valuable; Commercial WIM equipment applied in statewide sampling procedure, yet this M.O.E.
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Application Ranking: 5 Superior. Commercially available WIM equipment generates data for easy computation of this measure.
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From page 119... ...
This measure is highly amenable to emerging technology. Bridge Formula Violations - Axie-spacing information, in combination with indi vidual-axle and axle-group~ng weights, applied to spacing criteria specified by the applicable Bridge Formula This M.O.E.
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From page 120... ...
Commercial WIM equipment applied in statewide sampling procedure, yet this M.O.E. demands measurement specificity.
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From page 121... ...
is "excess ESALs equal the sum of the total ESALs attributable to the illegal portion of the individual single or tandem axle group." The signifi cance of application of this M.O.E. is that forty percent of observed ESALs on Wis cons~n's Rural Interstate System were attributable to excess ESALs.
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From page 122... ...
Commercially available WIM equipment generates data for easy computation of this measure.
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Application Ranking: 3 Useful. Commercially available WIM equipment generates data users!
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MO.E. Compatibility with State Agency Data Collection Methods Ranking: 5 Superior; Commercially available WIM equipment readily generates data by day-of-week arid hour-of-day.
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From page 125... ...
No points ~ point 2 points 3 points 4 points 5 points No value whatever Insignificant worth Some utility Moderately useful Significantly valuable Superior merit discussed in Chapter 3.
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Definition In accordance with project objectives and in compliance with He NCHRP Project 20-34 Problem Statement, a final M.O.E. list was developed.
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From page 127... ...
is a: ct c, ~ I:FE=E KR~.
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From page 128... ...
of the total ob Gross Weight Violation, Proportion served truck sample which exceeds the le gal gross weight limit. The extent to which average measured Gross Weight Violation, Severity gross weights for the observed sub-sample of gross weight violators exceeds the legal gross weight limit.
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Key Terms
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