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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
0.04 1
0.05 2
0.05 3
0.06 4
0.07 5
0.09 6
0.10 7
0.11 8
0.13 9
0.14 10
0.16 11
0.18 12
0.19 13
0.21 14
0.23 15
0.24 16
0.26 17
0.27 18
0.29 19
0.31 20
0.32 21
0.34 22
0.36 23
0.37 24
0.39 25
0.41 26
0.43 27
0.44 28
0.46 29
0.48 30
0.50 31
0.52 32
0.54 33
0.56 34
0.58 35
0.60 36
0.62 37
0.64 38
0.66 39
0.68 40
0.70 41
0.72 42
0.75 43
0.77 44
0.79 45
0.82 46
0.84 47
0.88 48
0.90 49
0.92 50
0.95 51
1.00 52
1.01 53
1.04 54
1.07 55
1.10 56
1.13 57
1.16 58
1.19 59
1.24 60
1.27 61
1.31 62
1.35 63
1.39 64
1.42 65
1.47 66
1.51 67
1.56 68
1.60 69
1.65 70
1.70 71
1.75 72
1.80 73
1.85 74
1.90 75
1.96 76
2.03 77
2.09 78
2.15 79
2.22 80
2.28 81
2.37 82
2.44 83
2.53 84
2.63 85
2.72 86
2.82 87
2.94 88
3.07 89
3.22 90
3.36 91
3.51 92
3.68 93
3.92 94
4.15 95
4.46 96
4.88 97
5.41 98
6.20 99
11.05 100