Jo Mama's Movers
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Beginning the the early 20th century, the 1920's saw several major advancements. There was improvement in rural roads which was significant for the time.The diesel engine, which are 25-40% more efficient than gas engines were also a major breakthrough.We also saw the standardization of truck and trailer sizes along with fifth wheel coupling systems. Additionally power assisted brakes and steering developed. By 1933, all states had some form of varying truck weight regulation.
There are certain characteristics of a truck that makes it an "off-road truck". They generally standard, extra heavy-duty highway-legal trucks.Although legal, they have off-road features like front driving axle and special tires for applying it to tasks such as logging and construction.The purpose-built off-road vehiclesare unconstrained byweighing limits, such as the
The American Association of State Highway Officials (AASHO)was organizedand founded on December 12, 1914.On November 13, 1973, the namewas alteredto the American Association of State Highway and Transportation Officials.This slight change in name reflects a broadened scope of attention towards all modes of transportation.Despite the implications of the name change, most of the activities itis involvedin still gravitate towards highways.
The American Association of State Highway and Transportation Officials (AASHTO) conducted a series of tests.These tests were extensive field tests of roads and bridges to assess damages to the pavement.In particular they wanted to know how traffic contributes to the deterioration of pavement materials. These testsessentiallyled to the 1964 recommendation by AASHTO to Congress.The recommendation determined the gross weight limit for trucks tobe determined bya bridge formula table. This includes table based on axle lengths, instead of a state upper limit. By the time 1970 came around, there were over 18 million truck on America's roads.