If the distance between the microphone location point and the microphone target point is other than 50 feet (15.2 meters), the maximum observed sound level reading generated by the motor vehicle in accordance with § 157.44 (relating to measurement procedures) shall be corrected as specified in the following table:

TABLE 2Distance Correction Factors If the distance between the microphone location point and the microphone target point isSound levelcorrection factor dB (A) 26-29 feet-7 29-32 feet-6 32-35 feet-5 35-39 feet-3 39-43 feet-2 43-48 feet-1 48-58 feet0 58-70 feet+1 70-83 feet+2 83-99 feet+3 99-118 feet+4