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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
0.00 1
0.01 2
0.01 3
0.01 4
0.02 5
0.02 6
0.03 7
0.03 8
0.03 9
0.04 10
0.04 11
0.04 12
0.05 13
0.05 14
0.06 15
0.06 16
0.07 17
0.07 18
0.08 19
0.08 20
0.09 21
0.09 22
0.10 23
0.10 24
0.11 25
0.11 26
0.11 27
0.12 28
0.12 29
0.13 30
0.14 31
0.14 32
0.15 33
0.15 34
0.16 35
0.16 36
0.17 37
0.18 38
0.18 39
0.19 40
0.19 41
0.20 42
0.21 43
0.21 44
0.22 45
0.23 46
0.23 47
0.24 48
0.25 49
0.25 50
0.26 51
0.26 52
0.27 53
0.28 54
0.29 55
0.30 56
0.31 57
0.31 58
0.32 59
0.33 60
0.34 61
0.35 62
0.36 63
0.37 64
0.38 65
0.39 66
0.41 67
0.42 68
0.43 69
0.45 70
0.46 71
0.48 72
0.50 73
0.51 74
0.52 75
0.54 76
0.56 77
0.58 78
0.61 79
0.63 80
0.66 81
0.68 82
0.71 83
0.74 84
0.77 85
0.79 86
0.84 87
0.89 88
0.95 89
1.01 90
1.05 91
1.11 92
1.19 93
1.27 94
1.38 95
1.51 96
1.64 97
1.91 98
2.39 99
5.44 100