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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
0.37 1
0.52 2
0.60 3
0.68 4
0.75 5
0.81 6
0.88 7
0.94 8
1.00 9
1.04 10
1.09 11
1.15 12
1.20 13
1.24 14
1.28 15
1.32 16
1.36 17
1.42 18
1.47 19
1.50 20
1.55 21
1.60 22
1.63 23
1.67 24
1.71 25
1.75 26
1.80 27
1.83 28
1.85 29
1.89 30
1.93 31
1.97 32
2.01 33
2.05 34
2.09 35
2.12 36
2.17 37
2.21 38
2.24 39
2.28 40
2.34 41
2.39 42
2.45 43
2.49 44
2.55 45
2.59 46
2.63 47
2.66 48
2.73 49
2.78 50
2.80 51
2.83 52
2.87 53
2.91 54
2.94 55
2.97 56
3.02 57
3.06 58
3.10 59
3.13 60
3.18 61
3.25 62
3.30 63
3.35 64
3.41 65
3.46 66
3.51 67
3.56 68
3.64 69
3.73 70
3.80 71
3.89 72
3.96 73
4.06 74
4.14 75
4.27 76
4.34 77
4.46 78
4.57 79
4.70 80
4.87 81
5.03 82
5.20 83
5.42 84
5.55 85
5.67 86
5.97 87
6.23 88
6.58 89
6.86 90
7.26 91
7.75 92
8.32 93
8.98 94
9.63 95
10.75 96
11.97 97
14.85 98
28.10 99
930.00 100