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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
0.17 1
0.32 2
0.44 3
0.53 4
0.62 5
0.72 6
0.81 7
0.88 8
0.95 9
1.03 10
1.11 11
1.18 12
1.25 13
1.31 14
1.38 15
1.44 16
1.51 17
1.57 18
1.63 19
1.69 20
1.76 21
1.81 22
1.88 23
1.94 24
2.00 25
2.06 26
2.13 27
2.18 28
2.24 29
2.30 30
2.37 31
2.42 32
2.48 33
2.54 34
2.59 35
2.64 36
2.70 37
2.76 38
2.82 39
2.88 40
2.94 41
3.00 42
3.07 43
3.14 44
3.20 45
3.27 46
3.34 47
3.41 48
3.48 49
3.54 50
3.61 51
3.68 52
3.75 53
3.82 54
3.90 55
3.98 56
4.06 57
4.13 58
4.21 59
4.28 60
4.36 61
4.44 62
4.53 63
4.61 64
4.69 65
4.78 66
4.88 67
4.97 68
5.05 69
5.15 70
5.24 71
5.34 72
5.45 73
5.55 74
5.65 75
5.77 76
5.88 77
6.00 78
6.13 79
6.27 80
6.41 81
6.56 82
6.71 83
6.87 84
7.05 85
7.25 86
7.47 87
7.65 88
7.88 89
8.10 90
8.36 91
8.67 92
8.98 93
9.40 94
9.88 95
10.39 96
11.11 97
12.18 98
13.81 99
25.90 100