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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.

  • 24
  • 18
  • 12
  • 6
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.22 1
0.33 2
0.42 3
0.52 4
0.61 5
0.69 6
0.80 7
0.88 8
1.00 9
1.04 10
1.13 11
1.21 12
1.30 13
1.39 14
1.47 15
1.56 16
1.64 17
1.72 18
1.81 19
1.89 20
2.01 21
2.06 22
2.15 23
2.25 24
2.34 25
2.41 26
2.51 27
2.60 28
2.68 29
2.78 30
2.86 31
3.00 32
3.06 33
3.15 34
3.25 35
3.34 36
3.43 37
3.54 38
3.63 39
3.72 40
3.82 41
3.91 42
4.03 43
4.13 44
4.23 45
4.34 46
4.45 47
4.55 48
4.67 49
4.78 50
4.89 51
5.02 52
5.12 53
5.24 54
5.36 55
5.50 56
5.60 57
5.72 58
5.85 59
6.01 60
6.12 61
6.25 62
6.39 63
6.54 64
6.68 65
6.82 66
7.01 67
7.13 68
7.29 69
7.44 70
7.61 71
7.79 72
8.00 73
8.16 74
8.34 75
8.53 76
8.73 77
8.93 78
9.16 79
9.37 80
9.61 81
9.86 82
10.10 83
10.37 84
10.67 85
11.02 86
11.30 87
11.67 88
12.04 89
12.46 90
12.91 91
13.41 92
14.01 93
14.62 94
15.35 95
16.21 96
17.26 97
18.58 98
20.68 99
30.00 100