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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
0.29 2
0.42 3
0.51 4
0.62 5
0.71 6
0.78 7
0.86 8
0.93 9
1.01 10
1.08 11
1.16 12
1.22 13
1.28 14
1.34 15
1.41 16
1.47 17
1.53 18
1.59 19
1.65 20
1.72 21
1.78 22
1.84 23
1.90 24
1.95 25
2.02 26
2.07 27
2.12 28
2.18 29
2.23 30
2.30 31
2.36 32
2.41 33
2.48 34
2.54 35
2.60 36
2.67 37
2.72 38
2.79 39
2.85 40
2.92 41
2.98 42
3.04 43
3.10 44
3.16 45
3.23 46
3.29 47
3.36 48
3.41 49
3.47 50
3.55 51
3.61 52
3.67 53
3.75 54
3.81 55
3.87 56
3.96 57
4.03 58
4.11 59
4.19 60
4.27 61
4.34 62
4.43 63
4.51 64
4.60 65
4.67 66
4.77 67
4.86 68
4.95 69
5.03 70
5.13 71
5.23 72
5.33 73
5.43 74
5.55 75
5.65 76
5.75 77
5.87 78
5.98 79
6.12 80
6.28 81
6.41 82
6.55 83
6.70 84
6.87 85
7.03 86
7.22 87
7.42 88
7.65 89
7.87 90
8.14 91
8.47 92
8.79 93
9.16 94
9.64 95
10.10 96
10.69 97
11.62 98
13.18 99
27.94 100