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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
0.30 2
0.40 3
0.53 4
0.64 5
0.73 6
0.83 7
0.91 8
1.00 9
1.08 10
1.16 11
1.22 12
1.29 13
1.37 14
1.43 15
1.50 16
1.56 17
1.62 18
1.68 19
1.74 20
1.81 21
1.88 22
1.93 23
2.00 24
2.06 25
2.12 26
2.18 27
2.24 28
2.29 29
2.35 30
2.41 31
2.47 32
2.53 33
2.59 34
2.65 35
2.71 36
2.77 37
2.83 38
2.89 39
2.95 40
3.02 41
3.07 42
3.14 43
3.20 44
3.26 45
3.32 46
3.38 47
3.45 48
3.52 49
3.59 50
3.65 51
3.72 52
3.80 53
3.87 54
3.94 55
4.01 56
4.09 57
4.17 58
4.23 59
4.32 60
4.40 61
4.47 62
4.54 63
4.61 64
4.70 65
4.78 66
4.87 67
4.96 68
5.04 69
5.15 70
5.23 71
5.33 72
5.42 73
5.54 74
5.66 75
5.77 76
5.89 77
6.02 78
6.16 79
6.28 80
6.41 81
6.56 82
6.74 83
6.89 84
7.08 85
7.25 86
7.45 87
7.65 88
7.87 89
8.10 90
8.35 91
8.67 92
9.01 93
9.39 94
9.86 95
10.41 96
11.13 97
12.07 98
13.61 99
25.37 100