All Around Moverz
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The year 1611 marked an important time for trucks, as that is when the word originated. The usage of "truck" referred to the small strong wheels on ships' cannon carriages. Further extending its usage in 1771, it came to refer to carts for carrying heavy loads. In 1916 it became shortened, calling it a "motor truck".While since the 1930's its expanded application goes as faras tosay "motor-powered load carrier".
Trailer 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.
In the United States, the Commercial Motor Vehicle Safety Act of 1986 established minimum requirements that must be met when a state issues a commercial driver's license CDL. It specifies the following types of license: - Class A CDL drivers. Drive vehicles weighing 26,001 pounds or greater, or any combination of vehicles weighing 26,001 pounds or greater when towing a trailer weighing more than 10,000 pounds. Transports quantities of hazardous materials that require warning placards under Department of Public Safety regulations. - Class A Driver License permits. Is a step in preparation for Class A drivers to become a Commercial Driver. - Class B CDL driver. Class B is designed to transport 16 or more passengers (including driver) or more than 8 passengers (including the driver) for compensation. This includes, but is not limited to, tow trucks, tractor trailers, and buses.
As of January 1, 2000, the Federal Motor Carrier Safety Administration (FMCSA)was establishedas its own separate administration within the U.S. Department of Transportation. This came about under the "Motor Carrier Safety Improvement Act of 1999".The FMCSAis basedin Washington, D.C., employing more than 1,000 people throughout all 50 States, including in the District of Columbia.Their staff dedicates themselves to the improvement of safety among commercial motor vehicles (CMV) and to saving lives.
DOT officers of each state are generally in charge of the enforcement of the Hours of Service (HOS). These are sometimes checked when CMVs pass through weigh stations. Drivers found to be in violation of the HOS canbe forcedto stop driving for a certain period of time. This, in turn, maynegativelyaffect the motor carrier's safety rating. Requests to change the HOS are a source of debate. Unfortunately, many surveysindicatedriversroutinelyget away with violating the HOS.Such facts have started yet another debate on whether motor carriers shouldbe requiredto us EOBRs in their vehicles.Relying on paper-based log books does not always seem to enforce the HOS law put in place for the safety of everyone.