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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
0.06 1
0.07 2
0.08 3
0.09 4
0.09 5
0.10 6
0.11 7
0.11 8
0.13 9
0.13 10
0.14 11
0.15 12
0.15 13
0.16 14
0.17 15
0.17 16
0.18 17
0.19 18
0.20 19
0.21 20
0.22 21
0.23 22
0.24 23
0.25 24
0.26 25
0.28 26
0.29 27
0.30 28
0.34 29
0.34 30
0.37 31
0.39 32
0.41 33
0.45 34
0.47 35
0.51 36
0.53 37
0.56 38
0.58 39
0.61 40
0.64 41
0.67 42
0.69 43
0.72 44
0.76 45
0.78 46
0.80 47
0.84 48
0.86 49
0.90 50
0.91 51
0.94 52
1.01 53
1.02 54
1.05 55
1.09 56
1.11 57
1.15 58
1.19 59
1.23 60
1.26 61
1.29 62
1.34 63
1.38 64
1.43 65
1.43 66
1.51 67
1.54 68
1.58 69
1.67 70
1.68 71
1.72 72
1.77 73
1.82 74
1.88 75
1.94 76
2.02 77
2.03 78
2.10 79
2.15 80
2.22 81
2.31 82
2.36 83
2.50 84
2.52 85
2.63 86
2.73 87
2.86 88
3.02 89
3.10 90
3.29 91
3.35 92
3.58 93
3.76 94
4.05 95
4.40 96
4.83 97
5.51 98
6.84 99
15.25 100