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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
0.17 1
0.29 2
0.39 3
0.51 4
0.60 5
0.70 6
0.79 7
0.87 8
0.95 9
1.04 10
1.11 11
1.19 12
1.26 13
1.34 14
1.42 15
1.51 16
1.58 17
1.65 18
1.72 19
1.79 20
1.87 21
1.95 22
2.04 23
2.10 24
2.17 25
2.24 26
2.32 27
2.40 28
2.46 29
2.54 30
2.60 31
2.67 32
2.75 33
2.83 34
2.91 35
3.00 36
3.05 37
3.12 38
3.20 39
3.28 40
3.35 41
3.43 42
3.51 43
3.58 44
3.67 45
3.73 46
3.82 47
3.91 48
4.00 49
4.06 50
4.15 51
4.25 52
4.34 53
4.43 54
4.53 55
4.61 56
4.70 57
4.80 58
4.89 59
4.97 60
5.07 61
5.18 62
5.30 63
5.40 64
5.52 65
5.63 66
5.76 67
5.88 68
6.01 69
6.11 70
6.24 71
6.37 72
6.51 73
6.63 74
6.77 75
6.92 76
7.08 77
7.24 78
7.41 79
7.60 80
7.79 81
7.96 82
8.17 83
8.42 84
8.65 85
8.88 86
9.13 87
9.39 88
9.67 89
9.97 90
10.32 91
10.69 92
11.09 93
11.57 94
12.12 95
12.74 96
13.65 97
14.84 98
16.48 99
27.17 100