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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
0.20 1
0.31 2
0.41 3
0.51 4
0.61 5
0.71 6
0.80 7
0.89 8
1.00 9
1.07 10
1.16 11
1.23 12
1.31 13
1.39 14
1.47 15
1.54 16
1.62 17
1.69 18
1.77 19
1.85 20
1.93 21
2.01 22
2.08 23
2.16 24
2.23 25
2.31 26
2.38 27
2.46 28
2.54 29
2.62 30
2.70 31
2.77 32
2.86 33
2.93 34
3.02 35
3.08 36
3.16 37
3.25 38
3.32 39
3.41 40
3.50 41
3.58 42
3.65 43
3.74 44
3.83 45
3.93 46
4.02 47
4.09 48
4.18 49
4.27 50
4.35 51
4.44 52
4.54 53
4.63 54
4.72 55
4.83 56
4.93 57
5.04 58
5.14 59
5.26 60
5.37 61
5.47 62
5.58 63
5.69 64
5.79 65
5.91 66
6.02 67
6.14 68
6.26 69
6.39 70
6.51 71
6.66 72
6.79 73
6.94 74
7.09 75
7.24 76
7.39 77
7.55 78
7.72 79
7.88 80
8.06 81
8.25 82
8.45 83
8.67 84
8.89 85
9.11 86
9.36 87
9.62 88
9.94 89
10.24 90
10.54 91
10.94 92
11.39 93
11.91 94
12.53 95
13.19 96
13.95 97
15.17 98
17.02 99
29.94 100