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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
0.17 1
0.29 2
0.41 3
0.52 4
0.61 5
0.70 6
0.79 7
0.86 8
0.94 9
1.01 10
1.09 11
1.16 12
1.23 13
1.29 14
1.35 15
1.41 16
1.48 17
1.53 18
1.59 19
1.67 20
1.72 21
1.79 22
1.85 23
1.91 24
1.97 25
2.03 26
2.09 27
2.15 28
2.20 29
2.26 30
2.32 31
2.37 32
2.43 33
2.49 34
2.55 35
2.61 36
2.67 37
2.73 38
2.80 39
2.87 40
2.93 41
2.99 42
3.06 43
3.12 44
3.18 45
3.25 46
3.31 47
3.38 48
3.44 49
3.50 50
3.56 51
3.63 52
3.68 53
3.76 54
3.83 55
3.90 56
3.97 57
4.05 58
4.12 59
4.19 60
4.27 61
4.35 62
4.44 63
4.51 64
4.58 65
4.67 66
4.77 67
4.86 68
4.95 69
5.05 70
5.14 71
5.24 72
5.34 73
5.44 74
5.56 75
5.67 76
5.78 77
5.90 78
6.03 79
6.16 80
6.30 81
6.45 82
6.59 83
6.72 84
6.91 85
7.08 86
7.27 87
7.49 88
7.69 89
7.90 90
8.17 91
8.46 92
8.82 93
9.19 94
9.60 95
10.08 96
10.71 97
11.62 98
13.10 99
27.90 100