In 1996 the Research Unit continued to collect traffic data for the Long Term Pavement Performance Program, hereinafter referred to as the LTPP program. The LTPP program is essentially comprised of on-site computers that apply collected data to an algorithm in order to classify vehicle traffic on a given segment of the highway. Due to various equipment problems, on-line time was reduced from 90% in 1995 to about 86% in 1996. The system would shut down due to power surges and could only be reactivated by manually resetting the system on site. However, due to budge cuts, no extra effort was made to rest or repair equipment malfunctions.
Traffic data was collected by two different systems, the Automatic Vehicle Classifier (AVC and the Weigh in Motion (WIM). Classification data taken by the AVC and the WIM equipment was very similar with only one or two exceptions. For example, a three-axle bus pulling a trailer or a travel home pulling a car would be registered as a Class 11 (semi-truck). Overall, traffic data collect was dtermined to be 90 percent accurate.
The purpose of this Guide is to help Long-Term Pavement Performance (LTPP) data users determine traffic parameters suitable for their analyses and ide...
For highway maintenance and planning purposes, each road segment is characterized by its traffic flow [such as the annual average daily traffic (AADT)...
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