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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 | ● | ●●●●● | ● |