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FMCSA - Federal Motor Carrier Safety Adminstration

CSA - Compliance, Safety, Accountability

Working Together for Safety.


SMS - Safety Measurement System SMS - Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

  • 20
  • 15
  • 10
  • 5
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.35 1
0.47 2
0.55 3
0.60 4
0.66 5
0.71 6
0.82 7
0.91 8
0.99 9
1.05 10
1.11 11
1.15 12
1.21 13
1.25 14
1.29 15
1.32 16
1.36 17
1.41 18
1.46 19
1.54 20
1.57 21
1.62 22
1.65 23
1.68 24
1.71 25
1.74 26
1.76 27
1.80 28
1.84 29
1.88 30
1.92 31
1.96 32
2.01 33
2.05 34
2.09 35
2.13 36
2.18 37
2.22 38
2.25 39
2.31 40
2.34 41
2.37 42
2.42 43
2.47 44
2.50 45
2.55 46
2.61 47
2.64 48
2.69 49
2.73 50
2.77 51
2.80 52
2.85 53
2.90 54
2.93 55
2.98 56
3.03 57
3.09 58
3.15 59
3.20 60
3.25 61
3.32 62
3.36 63
3.45 64
3.52 65
3.59 66
3.63 67
3.68 68
3.79 69
3.85 70
3.95 71
4.02 72
4.13 73
4.22 74
4.32 75
4.43 76
4.53 77
4.60 78
4.72 79
4.86 80
5.01 81
5.16 82
5.32 83
5.50 84
5.70 85
5.89 86
6.09 87
6.39 88
6.65 89
6.94 90
7.49 91
7.97 92
8.49 93
9.06 94
10.31 95
11.55 96
14.02 97
16.29 98
35.71 99
666.00 100