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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.

  • 4
  • 3
  • 2
  • 1
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.01 1
0.02 2
0.02 3
0.03 4
0.03 5
0.04 6
0.05 7
0.05 8
0.06 9
0.06 10
0.07 11
0.08 12
0.09 13
0.09 14
0.10 15
0.11 16
0.12 17
0.13 18
0.13 19
0.14 20
0.15 21
0.16 22
0.17 23
0.18 24
0.18 25
0.19 26
0.20 27
0.21 28
0.22 29
0.23 30
0.24 31
0.25 32
0.27 33
0.28 34
0.29 35
0.30 36
0.31 37
0.32 38
0.33 39
0.34 40
0.36 41
0.37 42
0.38 43
0.40 44
0.41 45
0.43 46
0.44 47
0.46 48
0.47 49
0.48 50
0.50 51
0.51 52
0.53 53
0.54 54
0.56 55
0.58 56
0.60 57
0.61 58
0.63 59
0.65 60
0.67 61
0.69 62
0.72 63
0.74 64
0.76 65
0.78 66
0.81 67
0.83 68
0.86 69
0.89 70
0.91 71
0.94 72
0.98 73
1.01 74
1.04 75
1.07 76
1.11 77
1.15 78
1.18 79
1.22 80
1.25 81
1.30 82
1.34 83
1.40 84
1.45 85
1.50 86
1.56 87
1.63 88
1.70 89
1.78 90
1.87 91
1.97 92
2.08 93
2.20 94
2.36 95
2.54 96
2.80 97
3.14 98
3.85 99
7.39 100