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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.

  • 16
  • 12
  • 8
  • 4
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.16 1
0.31 2
0.43 3
0.56 4
0.66 5
0.77 6
0.87 7
0.97 8
1.05 9
1.13 10
1.22 11
1.28 12
1.36 13
1.43 14
1.50 15
1.57 16
1.63 17
1.70 18
1.77 19
1.84 20
1.91 21
1.97 22
2.04 23
2.11 24
2.19 25
2.24 26
2.31 27
2.38 28
2.45 29
2.51 30
2.57 31
2.62 32
2.69 33
2.76 34
2.82 35
2.88 36
2.95 37
3.02 38
3.10 39
3.16 40
3.23 41
3.29 42
3.36 43
3.43 44
3.50 45
3.58 46
3.65 47
3.73 48
3.81 49
3.88 50
3.96 51
4.03 52
4.11 53
4.20 54
4.27 55
4.33 56
4.41 57
4.49 58
4.58 59
4.68 60
4.76 61
4.85 62
4.93 63
5.02 64
5.11 65
5.20 66
5.29 67
5.38 68
5.47 69
5.57 70
5.67 71
5.77 72
5.88 73
5.98 74
6.11 75
6.23 76
6.35 77
6.47 78
6.62 79
6.77 80
6.91 81
7.06 82
7.21 83
7.39 84
7.57 85
7.78 86
7.98 87
8.19 88
8.45 89
8.67 90
8.97 91
9.31 92
9.67 93
10.13 94
10.66 95
11.23 96
12.02 97
13.13 98
14.75 99
28.06 100