Accuracy class A(5) attained!  Back Home Next

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SiWIM system reached accuracy class A(5)!

Bridge data:

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reinforced concrete slab bridge

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8.2 meter simply supported span (15° skew)

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repaved surface

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in a village

Data used for accuracy calculation according to the European WIM Specifications

bullet3-axle rigid truck with gross weight 237 kN (11 runs) and 5-axle semi-trailer with gross weight 237 kN (10 runs)
bulletvehicle velocities between 27 and 45 km/h, velocity calibrated
bulletredistribution factor for first axles
bulletlimited reproducibility and environmental repeatability conditions
bulletinitial verification - calibration data used for accuracy assessment (dA(5) divided and dcrit multiplied by 0.8)

Detailed results according to the European WIM specifications

Criteria S Mean (%) STD (%) dA(5)
(%)		 dcrit (%) pcrit (%) pA(5) (%) Acc. class
Gross weight 21 0.05 0.67 4.0 1.9 91.1 100.0 A(5)
Axle groups 21 0.30 1.21 5.4 2.4 91.1 100.0
Single axles 31 -0.39 2.10 6.7 3.6 92.6 98.7

dA(5)
pA(5)
dcrit
pcrit

- confidence interval required for class A(5)

- confidence level in accuracy class A(5)

- confidence interval attained for individual criteria

- confidence level in attained confidence interval
 

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Last updated: 28-04-2005.