![]() ![]() To prevent trucks from being too long to maneuvering safely around turns encountered in cities and towns, the maximum length allowed from the kingpin to the trailer tandems is set by the individual states. This performance attribute is affected primarily by the distance from the trailer kingpin to the center of the trailer rear axle, otherwise known as the wheelbase of the semitrailer. Excessive low-speed offtracking may make it necessary for the driver to swing wide into adjacent lanes to execute the turn (that is, to avoid climbing the inside curbs or striking fixed objects like telephone poles). ![]() When a combination vehicle makes a low-speed turn - for example a 90-degree turn at an intersection - the wheels of the rearmost trailer axle follow a path several feet inside the path of the tractor steering axle. Let's take a look at these two laws and why they're put into effect. So once again, we have a mix of State and Federal regulations to contend with. On the other hand, the maximum allowed length from the trailer kingpin to the trailer tandems is set solely by the individual states. When the Interstate System axle and gross weight limits were adopted in 1956, and amended in 1975, States were allowed to keep or "grandfather" weight limits that were higher. The Bridge Formula is set by the Federal government but can be altered somewhat by the individual states. The two primary laws governing the placement of the tandems are the Bridge Formula and the maximum allowed length from Kingpin to trailer tandems. But there are laws regulating how far forward or back the tandems can be placed. One of the primary methods used to change the weight distribution across a truck's axles is to slide the trailer tandems toward the front or rear of the trailer. You can find it here: High Road 2.0 Limitations To Axle Spacing New! High Road 2.0! We have a new version of this program. ![]()
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