Two project types are specified in 23 CFR 772 as follows: Type I - defined as "a proposed Federal or Federalaid highway project for the construction of a highway on new location or the physical alteration of an existing highway which significantly changes either the horizontal or vertical alignment or increases the number of through-traffic lanes"; Type II - defined as "a proposed Federal or Federal-aid highway project for noise abatement on an existing highway". A Highway Traffic Noise Impact Study must be conducted for all Type I projects. The MDOT does not develop or implement Type II projects.
37 Miss. Code. R. § 1-8501-03010-202