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QuestionBeginning 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.

QuestionTrailer stability can be defined as the tendency of a trailer to dissipate side-to-side motion. The initial motion may be caused by aerodynamic forces, such as from a cross wind or a passing vehicle. One common criterion for stability is the center of mass location with respect to the wheels, which can usually be detected by tongue weight. If the center of mass of the trailer is behind its wheels, therefore having a negative tongue weight, the trailer will likely be unstable. Another parameter which is less commonly a factor is the trailer moment of inertia. Even if the center of mass is forward of the wheels, a trailer with a long load, and thus large moment of inertia, may be unstable.

QuestionThe American Association of State Highway and Transportation Officials (AASHTO) is an influential association as an advocate for transportation. Setting important standards, they are responsible for publishing specifications, test protocols, and guidelines. All whichare usedin highway design and construction throughout the United States. Despite its name, the association represents more thansolelyhighways. Alongside highways, they focus on air, rail, water, and public transportation as well.

QuestionBusiness routes generally follow the original routing of the numbered route through a city or town.Beginning in the 1930s and lasting thru the 1970s was an era marking a peak in large-scale highway construction in the United States. U.S. Highways and Interstates weretypicallybuilt in particular phases.Their first phase of development began with the numbered route carrying traffic through the center of a city or town.The second phase involved the construction of bypasses around the central business districts of the towns they began.As bypass construction continued, original parts of routes that had once passed straight thru a city would often become a "business route".


The concept of a bypass is a simple one. It is a road or highway thatpurposelyavoids or "bypasses" a built-up area, town, or village.Bypasseswere createdwith the intent to let through traffic flow without having to get stuck in local traffic. In general theyare supposedto reduce congestion in a built-up area. By doing so, road safety willgreatlyimprove.
A bypass designated for trucks traveling a long distance, either commercial or otherwise,is calleda truck route.

QuestionA Ministry of Transport (or) Transportationis responsible fortransportation within a country. Administration usually falls upon the Minister for Transport.The term may alsobe appliedto the departments or other government agencies administering transport in a nation who do not use ministers.There are various and vast responsibilities for agencies to oversee such as road safety. Others may include civil aviation, maritime transport, rail transport and so on. They continue to develop government transportation policy and organize public transit. All while trying to maintain and construct infrastructural projects. Some ministries haveadditionalresponsibilities in related policy areas as mentioned above.