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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
0.21 1
0.34 2
0.46 3
0.59 4
0.70 5
0.80 6
0.89 7
1.00 8
1.07 9
1.16 10
1.26 11
1.35 12
1.44 13
1.52 14
1.60 15
1.70 16
1.78 17
1.85 18
1.93 19
2.02 20
2.09 21
2.17 22
2.26 23
2.34 24
2.41 25
2.48 26
2.56 27
2.64 28
2.72 29
2.79 30
2.88 31
2.96 32
3.05 33
3.14 34
3.23 35
3.30 36
3.39 37
3.47 38
3.54 39
3.62 40
3.69 41
3.78 42
3.86 43
3.95 44
4.04 45
4.13 46
4.22 47
4.31 48
4.40 49
4.48 50
4.58 51
4.68 52
4.77 53
4.87 54
4.96 55
5.05 56
5.14 57
5.23 58
5.34 59
5.42 60
5.51 61
5.63 62
5.74 63
5.84 64
5.96 65
6.09 66
6.21 67
6.31 68
6.45 69
6.59 70
6.72 71
6.86 72
7.02 73
7.15 74
7.29 75
7.44 76
7.59 77
7.75 78
7.92 79
8.07 80
8.24 81
8.45 82
8.67 83
8.89 84
9.11 85
9.35 86
9.60 87
9.85 88
10.18 89
10.47 90
10.84 91
11.27 92
11.70 93
12.16 94
12.74 95
13.48 96
14.43 97
15.73 98
17.61 99
28.29 100