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Configuration of Heavy Trucks with Liftable Axles
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English
Abstract
Canada's Memorandum of Understanding on Vehicle Weights and Dimensions (M.o.U.) now defines the configuration of eight vehicles, based on regulatory principles derived from assessment of vehicle dynamic performance against objective measures that correlate with accident involvement. This process screened out a wide range of trucks equipped with liftable axles that operate in central and eastern Canada at considerably higher gross weights than most of the trucks meeting the strict conditions of the M.o.U.
The paper uses computer simulation to assess the stability and control characteristics of some straight trucks and tractor-semitrailer combinations with liftable axles against the same performance standards used as the basis for the M.o.U. It examines vehicle performance with liftable axles properly loaded, with them raised, and with alternative self-steering systems for the wheels of the liftable axle. It recommends some regulatory principles, and describes how one province has implemented these in its regulations. It then extends this into a discussion of approaches that might be considered by jurisdictions seeking to increase the allowable gross weight for heavy trucks.
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Authors
Citation
Billing, J., "Configuration of Heavy Trucks with Liftable Axles," SAE Technical Paper 932993, 1993, https://doi.org/10.4271/932993.Also In
References
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- “CCMTA/RTAC Vehicle Weights and Dimensions Study, Technical Steering Committee Final Report” Roads and Transportation Association of Canada Ottawa January 1987
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- “Recommended Regulatory Principles for Interprovincial Heavy Vehicle Weights and Dimensions” CCMTA/RTAC Vehicle Weights and Dimensions Study Implementation Committee Report September 1987
- “Memorandum of Understanding on Interprovincial Heavy Vehicle Weights and Dimensions” Roads and Transportation Association of Canada Ottawa February 1988
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- Gillespie T.D. MacAdam C.C. “Constant Velocity Yaw/Roll Program Users Manual” University of Michigan Transportation Research Institute Report UMTRI-82-39 October 1982
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- Billing A.M. “Tests of Self-Steering Axles” Ontario Ministry of Transportation and Communications Research and Development Division Report CVOS-TR-79-02 May 1979
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- “New Trucks for Greater Productivity and Less Road Wear” Transportation Research Board, Special Report 227 Washington, D.C. 1990
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- Billing J.R. Lam C.P. Couture J. “Development ot Regulatory Principles for Multi-axle Semitrailers” Second International Symposium on Heavy Vehicle Weights and Dimensions Kelowna, B.C. June 1989