Research to Support Evaluation of Truck Size and Weight Regulations (2019) / Chapter Skim
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From page 15... ...
15 2 Summary of the Roadmap The roadmap includes research problem statements outlining 27 research projects in six groups corresponding to the five categories of impact in the Statement of Task and one group of crosscutting topics (that is, topics relevant to several or all impact categories) (see Table 21 at the end of this chapter)
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16 FI G U R E 2 -1 R el at io n of r oa dm ap p ro je ct s to t he s tr uc tu re o f a tr uc k si ze a nd w ei gh t po lic y ev al ua ti on .
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SUMMARY OF THE ROADMAP 17 6. Present status of research: Literature references to existing research that addresses the problem, to indicate the state of knowledge on the problem and to use as examples of possible research approaches.
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18 EVALUATION OF TRUCK SIZE AND WEIGHT REGULATIONS An early start would be necessary for research problem statements C.1 (development of truck traffic, weight, and configuration data) and S.1 (enhancement of crash and exposure data for application in a research envi ronment)
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SUMMARY OF THE ROADMAP 19 longterm research program to fully meet analysis and information needs for managing the highway freight transportation system. The shortterm research program goal would be to provide the capability to respond with the best available impact estimates to the kinds of proposals that arise frequently at the federal and state levels for changes in size and weight regulations.
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20 EVALUATION OF TRUCK SIZE AND WEIGHT REGULATIONS • Comparative evaluations of crash risks of alternative configura tions using the casecontrol method. • Protocols for evaluating the performance of configurations using simulation, track testing, and road trials.
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SUMMARY OF THE ROADMAP 21 and possibly barge) and the distribution of truck freight among truck types.
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22 EVALUATION OF TRUCK SIZE AND WEIGHT REGULATIONS Pavement Analysis Methods for Heavier Axle Limits, Multi-Axle Groupings, and Alternative Tire and Suspension Types (Problem Statement P.1) This research would develop a pavement analysis framework that real istically simulates the impact of vehicles with maximum axle and gross weights, axle configurations, and lengths that differ from those in common use today on the actual pavements of the U.S.
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SUMMARY OF THE ROADMAP 23 bridge condition and truck traffic data is created, machine learning may be applicable to identify relationships of bridge condition and condition trend to bridge characteristics and truck load history. FHWA's LongTerm Bridge Performance Study could produce data better suited for modeling the effect of truck traffic on bridge performance.
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24 EVALUATION OF TRUCK SIZE AND WEIGHT REGULATIONS requirements, and data collection and analysis methods of trials; design an administrative structure; and finally conduct selected evaluations as a demonstration of the procedures. Predictions made in past truck size and weight limit studies of the safety consequences of changing the limits have most commonly relied on com parative crash rate estimates derived from historical data.
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SUMMARY OF THE ROADMAP 25 TABLE 2-1 Problem Statement Topics in the Research Roadmap Key Priority: • Projects included in one of the seven core research tracks: These projects could be started immediately, have a good probability of producing useful results within a practical time period and budget, and would contribute to the core research program for reducing uncertainty in truck size and weight limit evaluations. Most also would have broader value (beyond truck size and weight limit evaluations)
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26 EVALUATION OF TRUCK SIZE AND WEIGHT REGULATIONS Project Priority Broader Applications Coordination Requirements Bridge Research B.1 Compilation of information from highway agencies on costs and decision criteria for bridge repair, rehab, strengthening, and replacement For consid eration Provide bench mark for agency bridge manage ment practices State and local highway agencies B.2 Model of effect of wheel loads on bridge deck deterioration and service life, supported by field performance data Core track project Aid bridge management and deck design State and local highway agencies B.3 Models of effect of changes in size and weight on common bridge types, including effect on service life of loadcarrying members Core track project Aid general highway agency bridge management State and local highway agencies B.4 Method for estimating effect of changes in size and weight limits on lifecycle costs of bridge decks May be deferred B.5 Method for estimating the effect on bridge lifecycle cost of the change in deterioration and service life caused by changes in size and weight limits May be deferred B.6 Development of a replacement for the "Formula B" provision in federal law that more appropriately controls weights of short, heavy vehicles May be deferred B.7 Development of a revised deck design load and permit design load and calibration of load factors for both May be deferred Provide revised design loads to accommodate present actual loads Safety Research S.1 Enhancement of crash and exposure data for application in a research environment Core track project State and local highway and highway safety agencies S.2 Routebased or networkbased comparative evaluations of safety performance of truck configurations For consid eration State and local highway and highway safety agencies; NHTSA TABLE 2-1 Continued
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SUMMARY OF THE ROADMAP 27 Project Priority Broader Applications Coordination Requirements S.3 Comparative evaluations of safety performance of truck configurations using the casecontrol method Core track project State and local highway, highway safety, enforcement agencies S.4 Comparative evaluation of safety performance of truck configurations using trucking company data For consid eration State and local highway, enforcement agencies; truck operators S.5 Evaluation of safety performance of truck configurations with computer simulation modeling and track testing Core track project Identify safety improvement op portunities within present limits S.6 Model to project frequency of crashes on a road as a function of vehicle mix and traffic volume on the road May be deferred Evaluate safety policies concerning enforcement, traffic management, and road design Enforcement Research E.1 Relationship between enforcement effort and compliance with size and weight laws Core track project Aid planning and budgeting enforcement programs State and local highway, highway safety, enforcement agencies E.2 Detailed accounting of truck size and weight enforcement costs For consid eration Provide a bench mark for costs and expenditures Enforcement agencies E.3 Survey of truck size and weight enforcement and regulation in other countries May be deferred Identify immediately applicable improvements Road authorities of other countries E.4 Pilot studies to evaluate alternative enforcement methods, including information technology applications and automated enforcement May be deferred Identify immediately applicable improvements State and local highway and enforcement agencies; technology developers TABLE 2-1 Continued continued
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28 EVALUATION OF TRUCK SIZE AND WEIGHT REGULATIONS Project Priority Broader Applications Coordination Requirements Mode and Vehicle Choice and Freight Market Research M.1 Adaptation and testing of freight mode choice models for application in truck size and weight limit policy studies Core track project M.2 Mode and vehicle choice model for application in truck size and weight limit policy studies Core track project Evaluate user fee changes and other policies to mitigate truck costs May require shipper or truck operator survey; Census Bureau M.3 Method of projecting railroad industry revenue impact of changes in size and weight limits, including short line impacts For consid eration Railroad companies, FRA, Surface Transportation Board Cross-Cutting Topics; Evaluation of Regulatory Options C.1 Truck traffic, weight, and configuration databases necessary for truck size and weight research and evaluations Core track project Aid freight planning and asset management State and local highway agencies, FHWA LongTerm Infrastructure Programs C.2 Methods for incorporating common features of regulatory schemes in evaluations of costs and benefits of changing truck size and weight limits May be deferred C.3 Analysis framework for evaluating the potential of the coordination of size and weight regulations with other road management policies May be deferred Evaluate coordination benefits under present size and weight limits C.4 Protocols for staged pilot evaluations of truck configurations Core track project State and local highway agencies, highway safety agencies, enforcement agencies; truck operators TABLE 2-1 Continued
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29 T A B L E 2 -2 C or e R es ea rc h T ra ck s Pr oj ec t D es cr ip ti on Im po rt an ce f or E va lu at in g L im it s Sh or tc om in gs o f E xi st in g M et ho ds Fe as ib ili ty D ur at io n; C os t Fr ei gh t M ar ke t an d T ra ffi c T ru ck t ra ffi c, w ei gh t, an d co nfi gu ra ti on da ta ba se f ro m W IM an d ot he r so ur ce s E st im at e tr af fic v ol um es an d w ei gh t sp ec tr a fo r U .S .
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