Wavetronix SMARTSENSOR 105 Manuale Utente Scaricare il pdf (Pagina 14)

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Page 13

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Table 6. Vehicle Length Classification Comparison

Small Vehicles

Volumes Difference

Lane Manual SS 105 SS HD RTMS SS 105 SS HD RTMS

NB 1

895

527 866 811 -41% -3% -9%

NB 2

599

271 579 485 -55% -3% -19%

NB 3

272

153 267 253 -44% -2% -7%

NB Total

1,766

950 1,712 1,549 -46% -3% -12%

SB 3

337

105 325 353 -69% -4% 5%

SB 2

910

253 889 678 -72% -2% -25%

SB 1

584

175 562 651 -70% -4% 11%

SB Total

1,831

532 1,776 1,682 -71% -3% -8%

Medium Vehicles

Volumes Difference

Lane Manual SS 105 SS HD RTMS SS 105 SS HD RTMS

NB 1

384 58 102 1,321% 115% 278%

NB 2

431 105 182 353% 11% 92%

NB 3

167 20 71 1,092% 43% 407%

NB Total

136

981 183 355 621% 35% 161%

SB 3

242 32 10 1,761% 146% -23%

SB 2

727 86 291 1,018% 32% 348%

SB 1

439 58 54 854% 26% 17%

SB Total

124

1,407 176 355 1,035% 42% 186%

Large Vehicles

Volumes Difference

Lane Manual SS 105 SS HD RTMS SS 105 SS HD RTMS

NB 1

11 5 9 260% 67% 200%

NB 2

141

150 142 140 6% 1% -1%

NB 3

23 25 22 4% 14% 0%

NB Total

166

183 172 171 10% 4% 3%

SB 3

16 13 33 32% 8% 175%

SB 2

103 85 67 26% 4% -18%

SB 1

59 50 20 9% -7% -63%

SB Total

148

178 148 120 20% 0% -19%

Total

4,171

4,232 4,167 4,232 1% 0% 1%

Note: Data from 3:30 – 4:30 PM on 9/5/08 and 10:30 – 11:30 AM on 9/18/08

A second classification comparison was conducted among the three radar sensors and the

ATR. The data from the ATR was provided by the NDDOT, and the classification performed by

the ATR is based on the Federal Highway Administration (FHWA) 15-vehicle classification

scheme. Because of this, the 15-vehicle classes were grouped into 3 classes for comparison

with the sensors: small (Class 1-4), medium (Class 5-7), large (Class 8-15).

The ATR had similar accuracy to the SmartSensor HD, however, the SmartSensor HD was

slightly better overall (Table 7). This may be due to the grouping of classification bins, but there

didn’t seem to be any consistency with the ATR’s data. The ATR over-counted some of the

lanes, and under-counted others in both the medium and large bins.

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Wavetronix SMARTSENSOR 105 Manuale Utente Pagina 14

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