Review of Canadian Experience with the Regulation of Large Commercial Motor Vehicles (2010) / Chapter Skim
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Pages 9-25
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From page 9... ...
This led the provinces into a lengthy cooperative process to harmonize the regulations. This chapter presents • Some history of the evolution of size and weight regulation in Canada, • A summary of current size and weight limits, and • An outline of the institutional framework for truck size and weight regulation in Canada.
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From page 10... ...
. The OBF introduced the concept of greater allowable weight on an axle group with greater spread and became the means to control axle weights in Ontario, especially those of the short heavy vehicles mentioned above.
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Ontario B-train double from the early 1970s.
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From page 12... ...
, and double trailer combinations became much more popular, particularly in western Canada. 2.1.4 Canadian Council of Motor Transport Administrators/RTAC Vehicle Weights and Dimensions Study, 1981–1986 By 1981, improvements to highways and bridges across Canada allowed travel coast-to-coast for vehicles with a gross weight of 60,000 kg (132,276 lb)
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From page 13... ...
. It is a measure of the significance of the CCMTA/RTAC Vehicle Weights and Dimensions Study that this first symposium has been followed by nine others, as the 10th International Symposium on Heavy Vehicle Transport Technology took place in Paris during 2008.
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From page 14... ...
The box length of A- and C-train doubles was limited to 18.5 m (60 ft 8 in.) , while the B-train double was allowed 20 m (65 ft 7 in.)
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since 1988 The CCMTA/RTAC Vehicle Weights and Dimensions Study defined a standard process for assessing the dynamic performance of vehicles against base performance standards that were objectively related to highway safety (18)
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The range of straight trucks and truck-trailer combinations was defined, and the dynamic performance of these vehicles was assessed by computer simulation using the same methods as used during the CCMTA/RTAC Vehicle Weights and Dimensions Study (40)
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From page 17... ...
This combination met the dimensional limits for a B-train, but the significant hitch offset of the lead trailer fifth wheel resulted in poor dynamic performance for the pony trailer; • The allowable weight on the steer axle of a straight truck was increased to 7,250 kg (15,983 lb) ; • The caps on the weight of the second trailer of A- and C-train doubles were replaced by a requirement that the combined weight of the tractor drive axles and the lead trailer axles must be greater than the weight of the second trailer; • A clarification was added that a vehicle fitted with any liftable axles was recognized as meeting the "national standards," provided that when the liftable axles were raised, all other requirements were met; and • A clarification was added that each jurisdiction continued to retain authority to allow more liberal weights and dimensions, or different vehicle configurations, for trucking operations within their jurisdiction.
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From page 18... ...
Principally, it restricted the allowable load on a tri-axle with a 4.88-m (192-in.) spread to the same as for lesser spreads, increased its tandem and wide-spread tridem axle loads as had been previously agreed upon with the other provinces, and mandated that all quad-axle semitrailers from 2001 should have a selfsteering single axle, as shown in Figure 18.
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From page 19... ...
An extensive simulation study was used to define feasible configurations for use within Ontario, and as a compromise between the regulations of Ontario and Michigan (53) , two vehicles with different arrangements of two self-steering axles and a fixed tridem axle group, as shown in Figure 22 and Figure 23, were built and tested (54)
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From page 20... ...
The M.o.U. defines configurations for • Tractor-semitrailers, from 3 to 6 axles; • A-train doubles, from 5 to 8 axles; • B-train doubles, from 5 to 8 axles; • C-train doubles, from 5 to 8 axles; • A straight truck, with 2 or 3 axles; • A truck-pony trailer, from 3 to 6 axles; • A truck-full trailer, from 4 to 7 axles; and • An intercity bus, with 2 or 3 axles.
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From page 21... ...
on the five axles on the semitrailer, and the liftable self-steering axles must carry the same load as each fixed axle; • 6-axle semitrailers, similar to those seen in Figure 22 and Figure 23, and intended for operation between Ontario and Michigan, with a quadruple axle group instead of a tridem, and an allowed 39,000 kg (85,979 lb) on the semitrailer axles; and • A tridem drive tractor, which may pull any M.o.U.
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From page 22... ...
All new vehicles are evaluated from a safety performance, road and bridge infrastructure, and haul savings perspective. The Transportation Association of Canada (TAC)
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From page 23... ...
The Council of Deputy Ministers sponsors four programs: the Engineering and Research Support Committee, the Policy and Planning Support Committee, the Task Force on Vehicle Weights and Dimensions Policy, and the Canadian Council of Motor Transport Administrators. The Council of Ministers meets annually to deal with issues addressed to it by the Council of Deputy Ministers.
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From page 24... ...
It is a direct descendant of the original Implementation Planning Subcommittee of the CCMTA/RTAC Vehicle Weights and Dimensions Committee, formed in 1986 to transform the research from the CCMTA/RTAC Vehicle Weights and Dimensions Study into the M.o.U. Task Force members are expected to have a detailed knowledge of truck size and weight issues, have sufficient authority to represent the position and interests of their jurisdiction in a national discussion, and represent the national interests as agreed upon within the Task Force back to their jurisdiction so that it can be implemented.
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From page 25... ...
The results have been categorized by the impact of changes in size and weight limits in Canada on key issues, such as the following: • Safety, • Productivity, • Pavement impacts, • Bridge impacts, • Modal shift, • Environmental impacts, • Changes in truck fleet design and configuration, • Traffic congestion and roadway capacity, • Public perception, and • Impacts on trucking operations or regulations in U.S. border states.
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