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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.

  • 8
  • 6
  • 4
  • 2
  • 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
0.04 5
0.04 6
0.05 7
0.05 8
0.06 9
0.07 10
0.08 11
0.09 12
0.09 13
0.10 14
0.11 15
0.12 16
0.13 17
0.14 18
0.15 19
0.15 20
0.16 21
0.17 22
0.18 23
0.19 24
0.21 25
0.22 26
0.23 27
0.24 28
0.25 29
0.26 30
0.27 31
0.28 32
0.29 33
0.31 34
0.32 35
0.33 36
0.35 37
0.36 38
0.37 39
0.38 40
0.40 41
0.41 42
0.43 43
0.44 44
0.46 45
0.47 46
0.49 47
0.50 48
0.52 49
0.54 50
0.55 51
0.57 52
0.59 53
0.61 54
0.62 55
0.64 56
0.66 57
0.68 58
0.70 59
0.72 60
0.74 61
0.76 62
0.78 63
0.81 64
0.83 65
0.86 66
0.89 67
0.91 68
0.94 69
0.97 70
1.00 71
1.03 72
1.06 73
1.10 74
1.13 75
1.17 76
1.21 77
1.24 78
1.29 79
1.33 80
1.38 81
1.43 82
1.48 83
1.54 84
1.60 85
1.66 86
1.73 87
1.80 88
1.89 89
1.98 90
2.09 91
2.19 92
2.32 93
2.47 94
2.65 95
2.85 96
3.14 97
3.53 98
4.19 99
8.83 100