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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
0.04 2
0.05 3
0.06 4
0.07 5
0.08 6
0.09 7
0.10 8
0.11 9
0.12 10
0.13 11
0.14 12
0.16 13
0.17 14
0.19 15
0.20 16
0.22 17
0.23 18
0.25 19
0.26 20
0.28 21
0.29 22
0.31 23
0.32 24
0.34 25
0.35 26
0.37 27
0.39 28
0.40 29
0.42 30
0.44 31
0.46 32
0.48 33
0.50 34
0.52 35
0.53 36
0.55 37
0.57 38
0.60 39
0.62 40
0.64 41
0.67 42
0.68 43
0.70 44
0.73 45
0.75 46
0.78 47
0.80 48
0.83 49
0.85 50
0.88 51
0.91 52
0.93 53
0.96 54
1.01 55
1.03 56
1.05 57
1.08 58
1.11 59
1.15 60
1.18 61
1.21 62
1.25 63
1.28 64
1.32 65
1.37 66
1.41 67
1.45 68
1.50 69
1.54 70
1.60 71
1.65 72
1.70 73
1.76 74
1.83 75
1.89 76
1.95 77
2.02 78
2.09 79
2.16 80
2.23 81
2.32 82
2.41 83
2.51 84
2.60 85
2.69 86
2.82 87
2.94 88
3.07 89
3.21 90
3.36 91
3.53 92
3.73 93
3.91 94
4.19 95
4.48 96
4.85 97
5.48 98
6.29 99
11.67 100