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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.

  • 20
  • 15
  • 10
  • 5
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.35 1
0.52 2
0.58 3
0.67 4
0.73 5
0.78 6
0.85 7
0.93 8
0.97 9
1.01 10
1.06 11
1.13 12
1.18 13
1.22 14
1.26 15
1.33 16
1.37 17
1.43 18
1.46 19
1.51 20
1.56 21
1.59 22
1.63 23
1.67 24
1.70 25
1.77 26
1.81 27
1.84 28
1.88 29
1.91 30
1.95 31
1.98 32
2.02 33
2.04 34
2.07 35
2.12 36
2.16 37
2.20 38
2.22 39
2.29 40
2.35 41
2.40 42
2.45 43
2.50 44
2.54 45
2.57 46
2.62 47
2.67 48
2.71 49
2.76 50
2.80 51
2.83 52
2.86 53
2.90 54
2.95 55
2.99 56
3.03 57
3.08 58
3.14 59
3.18 60
3.23 61
3.27 62
3.32 63
3.37 64
3.42 65
3.52 66
3.59 67
3.65 68
3.71 69
3.78 70
3.86 71
3.95 72
4.07 73
4.18 74
4.26 75
4.33 76
4.42 77
4.48 78
4.62 79
4.72 80
4.84 81
4.99 82
5.11 83
5.35 84
5.56 85
5.79 86
5.90 87
6.07 88
6.30 89
6.62 90
7.07 91
7.42 92
7.87 93
8.37 94
9.03 95
10.30 96
11.97 97
14.79 98
21.31 99
724.81 100