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The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]
Ramp travel index. Ramp travel index or RTI, is a way of measuring a vehicle's ability to flex its suspension, a property also known as axle articulation. The RTI rating is used mainly in the off-roading industry to test and describe chassis limits of modified vehicles. The ramps vary between 15 and 30 degrees of angle for the vehicle to ride up.
The international roughness index (IRI) is the roughness index most commonly obtained from measured longitudinal road profiles. It is calculated using a quarter-car vehicle math model, whose response is accumulated to yield a roughness index with units of slope (in/mi, m/km, etc.). [1][2] Although a universal term, IRI is calculated per ...
Massachusetts Route 9. Route 9 is a 135.310-mile-long (217.760 km) major east–west state highway in Massachusetts, United States. Along with U.S. Route 20 (US 20), Route 2, and Interstate 90, Route 9 is one of the major east–west routes of Massachusetts. The western terminus is near the center of the city of Pittsfield.
Elias Akoury, left, road test manager for the Central Massachusetts Safety Council driving school, and examiner John Maceira ask an applicant to demonstrate hand signals for an RMV road test at 5 ...
Fourth power law. The fourth power law (also known as the fourth power rule) states that the stress on the road caused by a motor vehicle increases in proportion to the fourth power of its axle load. This law was discovered in the course of a series of scientific experiments in the United States in the late 1950s and was decisive for the ...
The PSI was developed based on the AASHO Road Test's present serviceability rating (PSR). AASHO Road Test was a set of experiments carried out by the AASHTO from 1956 to 1961. [4] Unlike the PSR, which was a ride quality rating that required a panel of observers to ride in a car over the pavement of interest, the PSI does not require a panel of ...
The AASHO road test was to study the performance of pavement structures of known thickness under moving loads of known magnitude and frequency. [citation needed] The study was carried out from August 1956 to November 30, 1960 in Ottawa, Illinois [2] and has been used as a primary source of experimental data when vehicle wear to highways is ...