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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
0.42 3
0.55 4
0.65 5
0.74 6
0.82 7
0.90 8
0.97 9
1.05 10
1.13 11
1.20 12
1.26 13
1.33 14
1.40 15
1.47 16
1.53 17
1.58 18
1.65 19
1.71 20
1.77 21
1.84 22
1.90 23
1.95 24
2.01 25
2.07 26
2.13 27
2.18 28
2.24 29
2.30 30
2.35 31
2.41 32
2.46 33
2.52 34
2.58 35
2.63 36
2.69 37
2.74 38
2.81 39
2.86 40
2.92 41
3.00 42
3.05 43
3.10 44
3.16 45
3.23 46
3.29 47
3.36 48
3.43 49
3.49 50
3.56 51
3.63 52
3.69 53
3.76 54
3.83 55
3.90 56
3.97 57
4.04 58
4.12 59
4.20 60
4.28 61
4.36 62
4.43 63
4.51 64
4.58 65
4.66 66
4.75 67
4.83 68
4.91 69
5.01 70
5.10 71
5.21 72
5.30 73
5.40 74
5.50 75
5.61 76
5.71 77
5.82 78
5.95 79
6.07 80
6.22 81
6.38 82
6.53 83
6.69 84
6.85 85
7.00 86
7.17 87
7.39 88
7.62 89
7.84 90
8.13 91
8.40 92
8.75 93
9.10 94
9.50 95
9.99 96
10.64 97
11.52 98
13.10 99
26.00 100