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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
0.34 2
0.45 3
0.56 4
0.67 5
0.76 6
0.86 7
0.93 8
1.03 9
1.13 10
1.22 11
1.33 12
1.41 13
1.51 14
1.60 15
1.68 16
1.78 17
1.86 18
2.01 19
2.04 20
2.15 21
2.23 22
2.33 23
2.41 24
2.51 25
2.60 26
2.68 27
2.77 28
2.86 29
3.00 30
3.04 31
3.15 32
3.25 33
3.34 34
3.44 35
3.54 36
3.63 37
3.72 38
3.82 39
3.93 40
4.03 41
4.13 42
4.23 43
4.34 44
4.45 45
4.56 46
4.68 47
4.78 48
4.89 49
5.02 50
5.11 51
5.22 52
5.34 53
5.45 54
5.58 55
5.70 56
5.82 57
6.00 58
6.08 59
6.21 60
6.34 61
6.50 62
6.63 63
6.77 64
6.91 65
7.08 66
7.21 67
7.38 68
7.53 69
7.70 70
7.85 71
8.03 72
8.20 73
8.40 74
8.58 75
8.78 76
9.01 77
9.17 78
9.41 79
9.61 80
9.82 81
10.08 82
10.34 83
10.61 84
10.91 85
11.22 86
11.55 87
11.88 88
12.28 89
12.67 90
13.10 91
13.54 92
14.06 93
14.63 94
15.33 95
16.18 96
17.20 97
18.47 98
20.69 99
30.00 100