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The road test used large road user panels to establish the present serviceability rating (PSR) for each test section. Since panel ratings are expensive, a substitute key parameter present serviceability index (PSI) was established. The PSI is based on data on the road's longitudinal roughness, patchwork, rutting, and cracking. Later studies ...
The service life of the road is thereby reduced with approximately the fourth power of the axle load. [1] The accuracy of the law of the fourth power is disputed among experts, since the test results depend on many other factors, such as climatic conditions, in addition to the factors mentioned above. [2]
The AA Foundation for Road Safety Research was created by the AA in 1986. [33] In 2002, the AA Motoring Trust charity was created to continue the AA's public interest and road safety activities; [ 34 ] its responsibilities were transferred to the IAM Motoring Trust, under the Institute of Advanced Motorists , at the end of 2006.
Driving licence-holding by people aged 90 or above has doubled in 10 years, sparking a call for mandatory eye tests to boost road safety. A record 153,000 Britons in that age group held a full ...
In its Frankfurt Motor Show preview edition of September 1977, the German magazine Auto, Motor und Sport reported that the engine of a TR7 press car had broken down and "started to boil" while undergoing a maximum speed measurement exercise over a 4 km (2.5 miles) stretch of track as part of a road test. [77]
Using several different types of tests, AAA recreated real-world driving conditions to illustrate the difference in fuel economy, and the EPA incorporated AAA's testing into their new procedures. The more accurate testing resulted in a reduction of miles per gallon claims between 5 and 25 percent, beginning with 2008 model year vehicles.
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The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. Despite its name, the association represents not only highways but air, rail, water, and public ...