Table 5.
Speed accuracy comparison between SCN and Sensys Wireless VDS [15].
| Sensys [15] | S3 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 11–19 Sep., 2006 | In the morning on 20 Oct., 2007 | In the afternoon on 20 Oct., 2007 | |||||||||
| 15-Min Quarter Number | Avg. Speed (mph)
|
Absolute Error (%) | 15-Min Quarter Number | Avg. Speed (mph)
|
Abs. Error (%) | 15-Min Quarter Number | Avg. Speed (mph)
|
Abs. Error (%) | |||
| Laser gun Ground Truth | VDS | Switching tape Ground Truth | SCN | Switching tape Ground Truth | SCN | ||||||
| 2 | 67.7 | 67.4 | 0.4 | S1 | 21.6 | 21.4 | 1.1 | S1 | 20.2 | 20.2 | 0.0 |
| 5 | 66.7 | 64.7 | 3.0 | S2 | 19.5 | 19.2 | 1.6 | S2 | 21.6 | 21.5 | 0.5 |
| 10 | 64.4 | 64.4 | 0.0 | S3 | 18.5 | 18.3 | 1.3 | S3 | 20.4 | 20.2 | 1 |
| 13 | 66.6 | 65.9 | 1.1 | S4 | 20.6 | 20.4 | 1.2 | S4 | 20.9 | 21.2 | 1.4 |
| 17 | 67.6 | 65.6 | 3.0 | S5 | 19.1 | 19 | 0.5 | ||||
| 21 | 66.8 | 66.1 | 1.0 | S6 | 21.6 | 21.4 | 0.9 | ||||
| MAPE | 1.4 | MAPE | 1.1 | MAPE | 0.7 | ||||||