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.
AMSA wanted to help consumers avoid untrustworthy or illegitimate movers. In January 2008, AMSA created the ProMover certification program for its members. As a member, you must have federal interstate operating authority.Members are also required to pass an annual criminal back check,be licensed bythe FMCSA, and agree to abide by ethical standards. This would include honesty in advertising and in business transaction with customers.Each must also sign a contract committing to adhere to applicable Surface Transportation Board and FMCSA regulations. AMSA also takes into consideration and examines ownership. They are very strict, registration with state corporation commissions.This means that the mover must maintain at least a satisfactory rating with the Better Business Bureau (BBB).As one can imagine, those that passare authorizedto display the ProMove logo on the websites and in marketing materials.However, those that fail willbe expelledfrom the program (and AMSA) if they cannot correct discrepancies during probation.
The word cargo is in reference to particular goods that are generally used for commercial gain. Cargo transportation is generally meant to mean by ship, boat, or plane.However, the term now applies to all types of freight, now including goods carried by train, van, or truck.This term is now used in the case of goods in the cold-chain, as perishable inventory is always cargo in transport towards its final home.Even when itis heldin climate-controlled facilities, it is important to remember perishable goods or inventory have a short life.
The FMCSA has established rules to maintain and regulate the safety of the trucking industry.According to FMCSA rules, driving a goods-carrying CMV more than 11 hours or to drive after having been on duty for 14 hours, is illegal.Due to such heavy driving, they need a break to complete other tasks such as loading and unloading cargo, stopping for gas and other required vehicle inspections, as well as non-working duties such as meal and rest breaks.The 3-hour difference between the 11-hour driving limit and 14 hour on-duty limit gives drivers time to take care of such duties.In addition, after completing an 11 to 14 hour on duty period, the driver muchbe allowed10 hours off-duty.
Business 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 most basic purpose of a trailer jack is to lift the trailer to a height that allows the trailer to hitch or unhitch to and from the towing vehicle. Trailer jacks may alsobe usedfor the leveling of the trailer during storage. To list a few common types of trailer jacks are A-frame jacks, swivel jacks, and drop-leg jacks. Other trailers, such as horse trailers, have a built-in jack at the tongue for this purpose.