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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
0.28 2
0.41 3
0.52 4
0.62 5
0.72 6
0.79 7
0.87 8
0.95 9
1.03 10
1.11 11
1.17 12
1.23 13
1.29 14
1.36 15
1.42 16
1.48 17
1.55 18
1.61 19
1.68 20
1.73 21
1.79 22
1.85 23
1.91 24
1.97 25
2.02 26
2.07 27
2.13 28
2.19 29
2.25 30
2.31 31
2.36 32
2.42 33
2.48 34
2.53 35
2.59 36
2.65 37
2.70 38
2.76 39
2.83 40
2.89 41
2.95 42
3.01 43
3.07 44
3.13 45
3.19 46
3.26 47
3.31 48
3.38 49
3.45 50
3.52 51
3.58 52
3.65 53
3.71 54
3.78 55
3.86 56
3.93 57
4.01 58
4.09 59
4.17 60
4.25 61
4.33 62
4.40 63
4.48 64
4.56 65
4.64 66
4.74 67
4.82 68
4.92 69
5.01 70
5.10 71
5.20 72
5.30 73
5.39 74
5.50 75
5.61 76
5.72 77
5.83 78
5.95 79
6.08 80
6.20 81
6.32 82
6.48 83
6.63 84
6.80 85
6.97 86
7.17 87
7.39 88
7.61 89
7.85 90
8.10 91
8.38 92
8.71 93
9.07 94
9.50 95
10.03 96
10.69 97
11.48 98
13.07 99
27.97 100