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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
0.02 1
0.02 2
0.03 3
0.03 4
0.04 5
0.05 6
0.05 7
0.06 8
0.07 9
0.08 10
0.08 11
0.09 12
0.10 13
0.11 14
0.12 15
0.13 16
0.13 17
0.14 18
0.15 19
0.16 20
0.17 21
0.18 22
0.19 23
0.20 24
0.21 25
0.22 26
0.23 27
0.24 28
0.25 29
0.26 30
0.28 31
0.29 32
0.30 33
0.31 34
0.32 35
0.33 36
0.35 37
0.36 38
0.37 39
0.39 40
0.40 41
0.42 42
0.43 43
0.45 44
0.46 45
0.48 46
0.49 47
0.51 48
0.53 49
0.54 50
0.56 51
0.58 52
0.60 53
0.62 54
0.63 55
0.66 56
0.68 57
0.70 58
0.72 59
0.74 60
0.76 61
0.79 62
0.81 63
0.83 64
0.86 65
0.88 66
0.91 67
0.94 68
0.98 69
1.00 70
1.04 71
1.07 72
1.11 73
1.14 74
1.18 75
1.22 76
1.26 77
1.31 78
1.35 79
1.40 80
1.45 81
1.50 82
1.56 83
1.62 84
1.68 85
1.75 86
1.83 87
1.90 88
1.98 89
2.08 90
2.20 91
2.33 92
2.46 93
2.61 94
2.79 95
3.03 96
3.33 97
3.78 98
4.41 99
9.15 100