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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.

  • 12
  • 9
  • 6
  • 3
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.10 1
0.25 2
0.39 3
0.56 4
0.68 5
0.78 6
0.85 7
0.94 8
0.98 9
1.06 10
1.11 11
1.15 12
1.23 13
1.28 14
1.34 15
1.38 16
1.42 17
1.46 18
1.50 19
1.55 20
1.60 21
1.65 22
1.69 23
1.75 24
1.80 25
1.83 26
1.88 27
1.93 28
1.98 29
2.04 30
2.07 31
2.12 32
2.17 33
2.21 34
2.24 35
2.30 36
2.35 37
2.40 38
2.44 39
2.47 40
2.51 41
2.56 42
2.61 43
2.65 44
2.70 45
2.75 46
2.80 47
2.84 48
2.89 49
2.94 50
2.99 51
3.05 52
3.11 53
3.15 54
3.18 55
3.22 56
3.27 57
3.32 58
3.37 59
3.43 60
3.49 61
3.56 62
3.62 63
3.68 64
3.73 65
3.79 66
3.84 67
3.89 68
3.96 69
4.03 70
4.09 71
4.16 72
4.22 73
4.31 74
4.38 75
4.45 76
4.51 77
4.60 78
4.67 79
4.75 80
4.82 81
4.94 82
5.03 83
5.13 84
5.25 85
5.39 86
5.52 87
5.71 88
5.92 89
6.09 90
6.34 91
6.62 92
6.88 93
7.15 94
7.47 95
7.82 96
8.29 97
9.15 98
10.97 99
20.89 100