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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.

  • 60
  • 45
  • 30
  • 15
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.07 1
0.10 2
0.13 3
0.15 4
0.18 5
0.21 6
0.24 7
0.27 8
0.30 9
0.33 10
0.36 11
0.39 12
0.42 13
0.45 14
0.47 15
0.51 16
0.55 17
0.58 18
0.61 19
0.65 20
0.68 21
0.71 22
0.75 23
0.78 24
0.81 25
0.85 26
0.89 27
0.92 28
0.96 29
1.00 30
1.05 31
1.09 32
1.13 33
1.19 34
1.24 35
1.28 36
1.33 37
1.39 38
1.44 39
1.49 40
1.56 41
1.62 42
1.68 43
1.75 44
1.81 45
1.90 46
1.98 47
2.05 48
2.14 49
2.20 50
2.27 51
2.37 52
2.45 53
2.57 54
2.67 55
2.77 56
2.85 57
3.01 58
3.11 59
3.23 60
3.38 61
3.55 62
3.67 63
3.82 64
3.94 65
4.09 66
4.28 67
4.50 68
4.71 69
4.95 70
5.18 71
5.39 72
5.67 73
6.00 74
6.25 75
6.67 76
6.97 77
7.27 78
7.65 79
8.00 80
8.49 81
9.05 82
9.65 83
10.22 84
10.81 85
11.60 86
12.20 87
12.97 88
14.34 89
15.68 90
17.01 91
18.91 92
21.01 93
23.60 94
26.33 95
31.02 96
36.26 97
46.55 98
66.79 99
140.00 100