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The bridge formula is a mathematical formula to limit the weight-to-length ratio of commercial motor vehicles in the U.S. to prevent road and bridge damage. It is part of federal weight and size regulations and applies to the Interstate System and some other routes.
Rand McNally provides mapping, software and hardware for consumer electronics, commercial transportation and education markets. Founded in 1856, the company is known for its atlases, road maps, globes, and random number books.
Learn about the history, regulation and current time zones of the U.S. and its territories. See a map of the nine standard time zones and their offsets from UTC, as well as the regions that observe daylight saving time.
The Ranally city rating system is a tool developed by Rand McNally & Co. to classify U.S. cities based on their economic function. The system is designed to reflect an underlying hierarchy whereby consumers and businesses go to a city of a certain size for a certain function; some functions are widely available and others are only available in the largest cities.
Learn about the history, design, and features of the U.S. Highway network, an integrated system of roads and highways numbered within a grid in the contiguous United States. Find out how the system is coordinated by AASHTO, how it relates to the Interstate Highway System, and what are the exceptions and special routes.
General Drafting Corporation of Convent Station, New Jersey, founded by Otto G. Lindberg in 1909, was one of the "Big Three" road map publishers in the United States from 1930 to 1970, along with H.M. Gousha and Rand McNally. [1]
The Robinson projection is a world map that shows the entire globe as a flat image, with straight parallels and gently curved meridians. It was created by Arthur H. Robinson in 1963 and is used by some mapmakers and agencies, such as the CIA and the ECDC.
Learn about the HOS rules that limit the driving and working hours of commercial motor vehicle (CMV) drivers in the US. Find out the purpose, enforcement, and exceptions of the HOS, and how they affect driver fatigue and safety.
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