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Table 7. Vehicle Length Classification Comparison 10/1/08
Small Vehicles
Volumes Difference
Lane Manual SS 105 SS HD RTMS ATR SS 105 SS HD RTMS ATR
NB 1
384
166 344 315 383 -57% -10% -18% 0%
NB 2
207
81 197 155 213 -61% -5% -25% 3%
NB 3
81
55 80 70 86 -32% -1% -14% 6%
NB Total
672
302 621 540 682 -55% -8% -20% 1%
SB 3
97
24 97 109 102 -75% 0% 12% 5%
SB 2
325
42 309 177 330 -87% -5% -46% 2%
SB 1
264
36 260 288 270 -86% -2% 9% 2%
SB Total
686
102 666 574 702 -85% -3% -16% 2%
Medium Vehicles
Volumes Difference
Lane Manual SS 105 SS HD RTMS ATR SS 105 SS HD RTMS ATR
NB 1
18
232 59 80 19 1,188% 228% 344% 6%
NB 2
63
195 62 104 31 209% -2% 65% -51%
NB 3
14
61 13 45 19 335% -7% 221% 36%
NB Total
95
488 134 229 69 413% 41% 141% -27%
SB 3
12
82 16 9 4 583% 33% -25% -67%
SB 2
53
329 54 169 34 520% 2% 219% -36%
SB 1
35
255 39 36 25 628% 11% 3% -29%
SB Total
100
666 109 214 63 566% 9% 114% -37%
Large Vehicles
Volumes % Difference
Lane Manual SS 105 SS HD RTMS ATR SS 105 SS HD RTMS ATR
NB 1
2
4 1 7 3 98% -50% 250% 50%
NB 2
61
79 71 72 86 29% 16% 18% 41%
NB 3
10
14 15 11 3 40% 50% 10% -70%
NB Total
73
97 87 90 92 33% 19% 23% 26%
SB 3
5
11 6 5 10 120% 20% 0% 100%
SB 2
52
63 56 52 61 21% 8% 0% 17%
SB 1
17
31 19 5 27 82% 12% -71% 59%
SB Total
74
105 81 62 98 41% 9% -16% 32%
Total
1,700
1,758 1,698 1,709 1,706 3% 0% 1% 0%
Sensor Mount Results
This study evaluated the use of sign-mounted sensors as an alternative to a dedicated mounting
system. This was done to determine if one type of mounting system was superior in terms of
volume accuracy. Both the SmartSensor 105 and SmartSensor HD were mounted on the sign,
and in both cases the accuracy of the sign-mounted configuration was slightly worse compared
to the tripod mounting system.
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