Skip to main content
Find a Lawyer

Code of Federal Regulations Title 49. Transportation § 49.325.73 Microphone distance correction factors. 1]

Current as of October 02, 2022 | Updated by FindLaw Staff

 1

 Table 1, in § 325.7 is a tabulation of the maximum allowable sound level readings taking into account both the distance correction factors contained in § 325.73 and the ground surface correction factors contained in § 325.75.

If the distance between the microphone location point and the microphone target point is other than 50 feet (15.2 m), the maximum observed sound level reading generated by the motor vehicle in accordance with § 325.39 of this part or the numerical average of the recorded maximum observed sound level readings generated by the motor vehicle in accordance with § 325.59 of this part shall be corrected as specified in the following table:

TABLE 2—DISTANCE CORRECTION FACTORS

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

The value
dB(A) to
be applied
to the observed sound level reading is—

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

-4

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

-3

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

-2

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

-1

48 feet (14.6 m) or more but less than 58 feet (17.7 m)․․․․․․․․․․․․․․․․․․․․․․․․․

0

58 feet (17.7 m) or more but less than 70 feet (21.3 m)․․․․․․․․․․․․․․․․․․․․․․․․․

+1

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

+2
Back to chapter list
Previous part of code Next part of code
Back to chapter list

Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.325.73 Microphone distance correction factors. 1] - last updated October 02, 2022 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-325-73/

Read this complete Code of Federal Regulations Title 49. Transportation § 49.325.73 Microphone distance correction factors. 1] on Westlaw

FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature or via Westlaw before relying on it for your legal needs.

Was this helpful?

Search all Codes

Welcome to FindLaw's Cases & Codes

A free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw's Learn About the Law.

Go to Learn About the Law

Latest Blog Posts

For Legal Professionals

Learn About the Law

Get help with your legal needs

FindLaw’s Learn About the Law features thousands of informational articles to help you understand your options. And if you’re ready to hire an attorney, find one in your area who can help.

Go to Learn About the Law

Need to find an attorney?

Search our directory by legal issue

Enter information in one or both fields (Required)

    More Options
    Copied to clipboard