- (1) "Existing Noise Level" means the noise level, Leq, resulting from the natural and mechanical sources and human activity, considered to be usually present in a particular area.
- (2) "Design Noise Level" means the noise level, Leq, calculated for the worst traffic noise conditions likely to occur on a regular basis using a method approved by FHWA.
- (3) "Type I Project" means a highway construction project that is related to an increase in traffic noise - construction of a highway on new location or the physical alteration of an existing highway which substantially changes the alignment or increases the number of through-traffic lanes or the addition of auxiliary lanes or interchange ramps.
- (4) "Type II Project" means a proposed highway project strictly for noise abatement on an existing highway.
- (5) "UDOT" means Utah Department of Transportation.
- (6) "FHWA" means Federal Highway Administration.
- (7) "dBA" means decibels of sound expressed or measured using the "A" weighting scale of a sound-pressure level meter.
- (8) "Leq" means the equivalent (average) sound level reported in units of dBA.
- (9) "AASHTO" means American Association of State Highway and Transportation Officials.
KEY: transportation, barriers, traffic noise abatement, highways
Date of Last Change: October 10, 2017
Notice of Continuation: October 4, 2021
Authorizing, and Implemented or Interpreted Law: 72-1-201; 72-7-101; 72-6-111