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Table 2 Average profile of the devices under test, expressed in terms of their average error (em) and uncertainties (U). Furthermore, a qualitative assessment of their sensitivity to environmental conditions is described using scores ranging from “very low sensitivity” () to “very high sensitivity” , through intermediate values expressed with a 0.5 score resolution ( = 0.5;  = 1)

From: Data accuracy on automatic traffic counting: the SMART project results

Device

Real time

Road Design

Statistical Analysis

Environmental sensitivity

em

U

em

U

em

U

Climate

Lighting

Traffic

Rain

Double technology

6,2

± 1,4

3,4

± 1,6

2,6

± 0,6

Triple technology

10,9

± 1,8

4,3

± 0,6

3,5

± 0,7

WIM Piezoelectric

10,8

± 2,3

7,4

± 1,4

5,7

± 1,8

Inductive loops

14,8

± 1,2

10,6

± 0,9

9,4

± 1,3

WIM Quartz

30,7

± 3,8

17,6

± 2,6

12,3

± 4,1

Laser scanner

40,1

± 3,4

24,1

± 2,0

19,8

± 3,6

Video Image

34,1

± 4,9