Code of Federal Regulations Title 49. Transportation § 49.325.7 Allowable noise levels

If the distance between the microphone location point and the microphone target point is—

31 ft ( 9.5m) or more but less than 35 ft (10.7m)

87

91

89

93

89

91

35 ft (10.7m) or more but less than 39 ft (11.9m)

86

90

88

92

88

90

39 ft (11.9m) or more but less than 43 ft (13.1m)

85

89

87

91

87

89

43 ft (13.1m) or more but less than 48 ft (14.6m)

84

88

86

90

86

88

48 ft (14.6m) or more but less than 58 ft (17.1m)

83

87

85

89

85

87

58 ft (17.1m) or more but less than 70 ft (21.3m)

82

86

84

88

84

86

70 ft (21.3m) or more but less than 83 ft (25.3m)

81

85

83

87

83

85