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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
0.16 13
0.17 14
0.18 15
0.19 16
0.20 17
0.21 18
0.22 19
0.23 20
0.25 21
0.26 22
0.27 23
0.29 24
0.30 25
0.33 26
0.35 27
0.38 28
0.40 29
0.43 30
0.45 31
0.50 32
0.51 33
0.55 34
0.57 35
0.60 36
0.63 37
0.67 38
0.68 39
0.71 40
0.73 41
0.77 42
0.78 43
0.81 44
0.84 45
0.85 46
0.89 47
0.91 48
0.93 49
1.01 50
1.02 51
1.03 52
1.08 53
1.11 54
1.11 55
1.17 56
1.21 57
1.25 58
1.26 59
1.28 60
1.34 61
1.38 62
1.43 63
1.43 64
1.47 65
1.54 66
1.57 67
1.62 68
1.67 69
1.68 70
1.74 71
1.82 72
1.84 73
1.88 74
2.00 75
2.02 76
2.03 77
2.09 78
2.15 79
2.21 80
2.26 81
2.34 82
2.45 83
2.51 84
2.54 85
2.68 86
2.76 87
2.86 88
3.01 89
3.09 90
3.31 91
3.39 92
3.64 93
3.84 94
4.13 95
4.45 96
4.91 97
5.55 98
6.72 99
17.53 100