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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.

  • 32
  • 24
  • 16
  • 8
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.34 1
0.45 2
0.59 3
0.66 4
0.74 5
0.82 6
0.90 7
0.96 8
1.02 9
1.09 10
1.15 11
1.21 12
1.28 13
1.33 14
1.39 15
1.44 16
1.50 17
1.56 18
1.61 19
1.66 20
1.71 21
1.76 22
1.82 23
1.87 24
1.91 25
1.96 26
2.02 27
2.07 28
2.13 29
2.19 30
2.24 31
2.29 32
2.33 33
2.38 34
2.44 35
2.51 36
2.56 37
2.60 38
2.66 39
2.73 40
2.78 41
2.83 42
2.89 43
2.95 44
3.02 45
3.07 46
3.15 47
3.21 48
3.28 49
3.35 50
3.41 51
3.48 52
3.56 53
3.64 54
3.72 55
3.78 56
3.86 57
3.95 58
4.04 59
4.12 60
4.20 61
4.30 62
4.38 63
4.47 64
4.56 65
4.66 66
4.75 67
4.86 68
4.99 69
5.11 70
5.24 71
5.39 72
5.51 73
5.65 74
5.79 75
5.94 76
6.14 77
6.31 78
6.52 79
6.77 80
7.00 81
7.21 82
7.46 83
7.84 84
8.16 85
8.54 86
8.87 87
9.35 88
9.88 89
10.46 90
11.18 91
12.11 92
13.12 93
14.37 94
15.65 95
17.61 96
20.34 97
25.22 98
37.73 99
240.00 100