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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
0.03 1
0.04 2
0.04 3
0.04 4
0.05 5
0.05 6
0.06 7
0.06 8
0.07 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
0.13 18
0.14 19
0.16 20
0.17 21
0.18 22
0.20 23
0.22 24
0.24 25
0.25 26
0.27 27
0.28 28
0.30 29
0.31 30
0.32 31
0.34 32
0.35 33
0.36 34
0.37 35
0.39 36
0.40 37
0.41 38
0.42 39
0.43 40
0.44 41
0.46 42
0.47 43
0.48 44
0.50 45
0.51 46
0.53 47
0.54 48
0.56 49
0.57 50
0.59 51
0.60 52
0.63 53
0.64 54
0.66 55
0.67 56
0.69 57
0.72 58
0.73 59
0.76 60
0.77 61
0.80 62
0.82 63
0.84 64
0.87 65
0.88 66
0.91 67
0.93 68
0.95 69
0.97 70
1.01 71
1.03 72
1.05 73
1.08 74
1.11 75
1.14 76
1.17 77
1.20 78
1.24 79
1.27 80
1.31 81
1.34 82
1.37 83
1.43 84
1.47 85
1.54 86
1.59 87
1.67 88
1.74 89
1.82 90
1.91 91
2.02 92
2.16 93
2.31 94
2.48 95
2.68 96
2.95 97
3.44 98
4.29 99
10.57 100