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Table 2. Lane Volume Comparison
Lanes Date
Manual SS 105 SS HD RTMS
TR SS HD S.M. SS 105 S.M.
Count Vol. Diff. Vol. Diff. Vol. Diff. Vol. Diff. Vol. Diff. Vol. Diff.
NB1
9/5 516 516 0% 521 1% 515 0% - - - - - -
9/18 409 406 -1% 408 0% 407 0% - - - - - -
10/1 404 402 0% 404 0% 402 -1% 405 0% - - - -
10/14 462 471 2% 701 52% - - - - - - 471 2%
10/16 452 468 4% - - 438 -3% - - 478 6% - -
NB2
9/5 526 525 0% 513 -2% 509 -3% - - - - - -
9/18 309 327 6% 313 1% 312 1% - - - - - -
10/1 328 355 8% 330 1% 331 0% 330 1% - - - -
10/14 429 442 3% 631 47% - - - - - - 496 16%
10/16 353 368 4% - - 349 -1% - - 350 -1% - -
NB3
9/5 220 228 4% 220 0%
235 7% - - - - - -
9/18 88 115 31% 92 5% 111 26% - - - - - -
10/1 104 130 25% 108 4% 126 17% 108 4% - - - -
10/14 145 171 18% 247 70% - - - - - - 141 -3%
10/16 117 129 10% - - 123 5% - - 106 -9% - -
SB1
9/5 415 403 -3% 407 -2% 429 3% - - - - - -
9/18 269 270 0% 263 -2% 296 10% - - - - - -
10/1 316 322 2% 318 1% 329 2% 322 2% - - - -
10/14 401 377 -6% 447 11% - - - - - - 494 23%
10/16 294 295 0% - - 289 -2% - - 338 15% - -
SB2
9/5 643 661 3% 645 0% 629 -2% - - - - - -
9/18 414 423 2% 415 0% 371
-
10%
- - - - - -
10/1 430 434 1% 419 -3% 398 -6% 425 -1% - - - -
10/14 489 523 7% 635 30% - - - - - - 615 26%
10/16 448 463 3% - - 440 -2% - - 434 -3% - -
SB3
9/5 247 249 1% 253 2% 252 2% - - - - - -
9/18 115 114 -1% 117 2% 120 4% - - - - - -
10/1 114 117 3% 119 4% 123 6% 116 2% - - - -
10/14 153 140 -8% 219 43% - - - - - - 134
-
12%
10/16 114 120 5% - - 124 9% - - 106 -7% - -
Notes: S.M. refers to the sign-mounted configuration
The highlighted cells represent a difference of more than 5%
When the sensor volumes are aggregated by direction, the overall accuracy improved due to
the balancing of the under- and over-counted vehicles. Similar to the lane comparisons, the
SmartSensor HD had the best overall accuracy for the directional comparisons followed by the
RTMS and SmartSensor 105. Compared to manual counts, the inaccuracies of the
SmartSensor HD, RTMS, and SmartSensor 105 ranged from -1% to 1%, -1% to 3%, and 0% to
6%, respectively (Table 3).
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