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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
0.18 1
0.31 2
0.44 3
0.57 4
0.68 5
0.78 6
0.89 7
0.98 8
1.06 9
1.14 10
1.21 11
1.28 12
1.36 13
1.43 14
1.50 15
1.56 16
1.63 17
1.69 18
1.76 19
1.82 20
1.87 21
1.94 22
2.01 23
2.07 24
2.12 25
2.19 26
2.24 27
2.30 28
2.36 29
2.42 30
2.48 31
2.54 32
2.60 33
2.66 34
2.71 35
2.78 36
2.84 37
2.91 38
2.97 39
3.03 40
3.09 41
3.15 42
3.22 43
3.29 44
3.36 45
3.42 46
3.50 47
3.57 48
3.65 49
3.70 50
3.76 51
3.83 52
3.89 53
3.97 54
4.05 55
4.12 56
4.20 57
4.27 58
4.34 59
4.42 60
4.50 61
4.58 62
4.67 63
4.73 64
4.82 65
4.92 66
5.01 67
5.09 68
5.19 69
5.27 70
5.37 71
5.48 72
5.58 73
5.69 74
5.80 75
5.93 76
6.04 77
6.16 78
6.29 79
6.42 80
6.57 81
6.72 82
6.91 83
7.08 84
7.25 85
7.47 86
7.67 87
7.91 88
8.12 89
8.36 90
8.63 91
8.94 92
9.26 93
9.71 94
10.15 95
10.83 96
11.58 97
12.52 98
14.12 99
26.47 100