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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
0.05 3
0.05 4
0.06 5
0.07 6
0.07 7
0.08 8
0.09 9
0.10 10
0.11 11
0.13 12
0.14 13
0.15 14
0.17 15
0.18 16
0.19 17
0.21 18
0.22 19
0.24 20
0.25 21
0.26 22
0.28 23
0.29 24
0.31 25
0.32 26
0.34 27
0.35 28
0.36 29
0.38 30
0.39 31
0.41 32
0.43 33
0.44 34
0.46 35
0.47 36
0.50 37
0.51 38
0.53 39
0.55 40
0.56 41
0.58 42
0.60 43
0.62 44
0.64 45
0.66 46
0.68 47
0.70 48
0.72 49
0.74 50
0.77 51
0.78 52
0.81 53
0.83 54
0.85 55
0.88 56
0.90 57
0.92 58
0.95 59
0.97 60
1.01 61
1.03 62
1.05 63
1.08 64
1.11 65
1.15 66
1.18 67
1.22 68
1.25 69
1.29 70
1.32 71
1.36 72
1.40 73
1.45 74
1.50 75
1.53 76
1.58 77
1.63 78
1.68 79
1.75 80
1.81 81
1.88 82
1.93 83
2.01 84
2.08 85
2.15 86
2.23 87
2.34 88
2.44 89
2.55 90
2.67 91
2.80 92
2.95 93
3.11 94
3.32 95
3.58 96
3.94 97
4.44 98
5.27 99
13.82 100