Equipment for Collecting Traffic Load Data (2004) / Chapter Skim
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Short-duration counts are most commonly collected for periods of 24 or 48 hours, although some highway agencies attempt to collect as many as seven consecutive days of such data. Portable sensors that are commonly used for collecting vehicle classification data include • Road tubes, • Piezoelectric sensors, • Fiber-optic cable, • Portable inductance loops, and • Magnetometers.
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From page 18... ...
2.2 WIM DATA 2.2.1 Short-Duration WIM Two technologies, capacitance mats and BL-style piezoelectric sensors, are commonly used in the United States for high-speed (i.e., on-highway) portable WIM data collection.
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From page 19... ...
Other sensor designs are under active development. The most common permanently mounted weight sensors are • Bending plates, • Hydraulic load cells, • Piezoceramic cables, • Piezopolymer cables, and • Piezoquartz sensors.
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From page 20... ...
A high-speed WIM system will not work accurately if the site selected for weighing is not conducive to weight data collection. ASTM specification E 13181 provides specific guidance on the pavement conditions needed for accurate WIM system performance.
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