67 Pa. Code § 157.44 - Measurement procedures

(a) Conditions. In accordance with the provisions of this section, a measurement shall be made of the sound level generated by a motor vehicle operating through the measurement area on the traveled lane of the highway within the test site, regardless of the highway grade, load, acceleration or deceleration.

(b) Maximum sound level reading. The second level generated by the motor vehicle shall be the highest reading observed on the sound level measurement system as the vehicle passes through the measurement area, corrected, when appropriate, in accordance with the provisions of Subchapter F (relating to correction factors).

Table 1 lists the range of maximum permissible sound level readings for various readings for various test conditions.

The sound level of the vehicle being measured shall be observed to rise at least six decibels (A) before the maximum sound level occurs and to fall at least six decibels (A) after the maximum sound level occurs in order to be considered a valid sound level reading.

Notes

67 Pa. Code § 157.44

This section cited in 67 Pa. Code § 157.51 (relating to microphone distance correction factors).