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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
0.02 4
0.02 5
0.03 6
0.03 7
0.03 8
0.04 9
0.04 10
0.05 11
0.05 12
0.06 13
0.06 14
0.07 15
0.07 16
0.07 17
0.08 18
0.08 19
0.09 20
0.09 21
0.10 22
0.10 23
0.11 24
0.12 25
0.12 26
0.13 27
0.13 28
0.14 29
0.14 30
0.15 31
0.15 32
0.16 33
0.17 34
0.17 35
0.18 36
0.18 37
0.19 38
0.19 39
0.20 40
0.21 41
0.21 42
0.22 43
0.23 44
0.23 45
0.24 46
0.24 47
0.25 48
0.26 49
0.27 50
0.27 51
0.28 52
0.29 53
0.29 54
0.30 55
0.31 56
0.32 57
0.33 58
0.34 59
0.35 60
0.35 61
0.36 62
0.37 63
0.39 64
0.40 65
0.41 66
0.42 67
0.43 68
0.44 69
0.46 70
0.47 71
0.49 72
0.50 73
0.51 74
0.53 75
0.54 76
0.56 77
0.57 78
0.59 79
0.61 80
0.63 81
0.65 82
0.67 83
0.69 84
0.72 85
0.75 86
0.78 87
0.81 88
0.85 89
0.89 90
0.94 91
1.00 92
1.06 93
1.15 94
1.23 95
1.36 96
1.55 97
1.88 98
2.55 99
10.75 100