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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
0.18 1
0.30 2
0.41 3
0.51 4
0.61 5
0.69 6
0.78 7
0.88 8
0.95 9
1.04 10
1.12 11
1.20 12
1.28 13
1.36 14
1.43 15
1.51 16
1.57 17
1.65 18
1.72 19
1.79 20
1.87 21
1.94 22
2.03 23
2.10 24
2.18 25
2.25 26
2.32 27
2.39 28
2.46 29
2.53 30
2.59 31
2.67 32
2.73 33
2.81 34
2.88 35
2.95 36
3.03 37
3.11 38
3.19 39
3.27 40
3.35 41
3.42 42
3.51 43
3.59 44
3.68 45
3.76 46
3.84 47
3.91 48
4.00 49
4.07 50
4.15 51
4.23 52
4.31 53
4.40 54
4.49 55
4.57 56
4.67 57
4.74 58
4.84 59
4.93 60
5.04 61
5.15 62
5.26 63
5.36 64
5.48 65
5.60 66
5.70 67
5.80 68
5.92 69
6.04 70
6.15 71
6.27 72
6.40 73
6.54 74
6.67 75
6.84 76
7.01 77
7.15 78
7.31 79
7.48 80
7.67 81
7.86 82
8.06 83
8.26 84
8.48 85
8.72 86
8.96 87
9.22 88
9.51 89
9.81 90
10.14 91
10.52 92
10.91 93
11.40 94
11.95 95
12.59 96
13.42 97
14.39 98
16.52 99
27.48 100