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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
0.30 2
0.42 3
0.56 4
0.67 5
0.77 6
0.87 7
0.95 8
1.03 9
1.09 10
1.16 11
1.23 12
1.31 13
1.38 14
1.45 15
1.51 16
1.58 17
1.65 18
1.71 19
1.78 20
1.83 21
1.88 22
1.95 23
2.01 24
2.08 25
2.14 26
2.20 27
2.26 28
2.31 29
2.37 30
2.43 31
2.48 32
2.54 33
2.59 34
2.65 35
2.72 36
2.78 37
2.85 38
2.91 39
2.97 40
3.03 41
3.10 42
3.16 43
3.23 44
3.30 45
3.37 46
3.43 47
3.50 48
3.58 49
3.65 50
3.72 51
3.78 52
3.84 53
3.91 54
3.98 55
4.04 56
4.11 57
4.19 58
4.26 59
4.34 60
4.41 61
4.49 62
4.57 63
4.65 64
4.73 65
4.83 66
4.92 67
5.00 68
5.09 69
5.18 70
5.27 71
5.38 72
5.48 73
5.58 74
5.69 75
5.81 76
5.92 77
6.05 78
6.18 79
6.32 80
6.46 81
6.61 82
6.78 83
6.95 84
7.13 85
7.32 86
7.52 87
7.72 88
7.96 89
8.19 90
8.48 91
8.75 92
9.11 93
9.49 94
9.98 95
10.56 96
11.29 97
12.23 98
13.93 99
25.05 100