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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.

  • 12
  • 9
  • 6
  • 3
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.08 1
0.10 2
0.13 3
0.14 4
0.16 5
0.17 6
0.20 7
0.21 8
0.23 9
0.25 10
0.26 11
0.29 12
0.33 13
0.34 14
0.35 15
0.38 16
0.41 17
0.44 18
0.48 19
0.51 20
0.54 21
0.59 22
0.62 23
0.65 24
0.69 25
0.72 26
0.76 27
0.79 28
0.84 29
0.88 30
0.90 31
1.00 32
1.01 33
1.02 34
1.04 35
1.10 36
1.15 37
1.17 38
1.21 39
1.26 40
1.28 41
1.33 42
1.39 43
1.41 44
1.43 45
1.50 46
1.52 47
1.57 48
1.62 49
1.67 50
1.72 51
1.75 52
1.76 53
1.80 54
1.87 55
1.91 56
2.01 57
2.02 58
2.06 59
2.13 60
2.19 61
2.26 62
2.33 63
2.34 64
2.35 65
2.41 66
2.51 67
2.56 68
2.63 69
2.68 70
2.75 71
2.81 72
2.93 73
3.01 74
3.03 75
3.12 76
3.24 77
3.35 78
3.45 79
3.52 80
3.61 81
3.76 82
3.88 83
4.02 84
4.15 85
4.29 86
4.44 87
4.61 88
4.75 89
5.01 90
5.18 91
5.39 92
5.67 93
6.01 94
6.34 95
6.81 96
7.26 97
8.08 98
9.57 99
22.83 100