X-LIMITS approach used in Australia and United States
The computer program X-LIMITS originally developed by ARRB for use by Australian and New Zealand state road authorities has been further developed as “USlimits” in collaboration with FHWA for application in the United States. The program requires data to be input on density of development, frequency of access, road function, carriageway characteristics (such as number of lanes and carriageway separation), flow, interchange spacing, existing vehicle speeds, adjoining limits, and any special features such as high local crash rates. On the basis of this data, the program calculates a recommended speed limit.
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