Acronyms & Definitions


AADT - Annual Average Daily Traffic: Total volume of vehicle traffic along a roadway on a typical day of the year. AADTs consider weekends and seasonal fluctuations of traffic.

ADT - Average Daily Traffic: Total volume of vehicle traffic during a given time period (in whole days), ADT is considered raw data.

EA - Environmental Assessment: A document prepared for actions in which the significance of the human and natural environmental impact are not clearly established.

EIS - Environmental Impact Statement: A document prepared for projects where it is anticipated that the action will have a significant effect on the human and natural environment.

FAST Act - Fixing America's Surface Transportation Act- Federal law approved on December 4, 2015. Authorizing funding of over $305 billion dollars through 2020, the FAST Act maintains the Federal Highway Administrations' focus on safety, keeps intact the established structure of the various highway-related programs they manage, continues efforts to streamline project delivery and, for the first time, provides a dedicated source of federal dollars for freight projects.

FHWA - Federal Highway Administration

FONSI - Finding of No Significant Impact: A FONSI is issued when an environmental analysis and review during the EA process found a project to have no significant impacts on the quality of the environment.

NEPA - National Environmental Policy Act: Establishes the basic framework for Federal agencies to consider the potential environmental consequences of their proposals, document the analysis and make the information available to the public for comment prior to implementation.

ROD - Record of Decision: Final step in the EIS process. The ROD identifies the Selected Alternative, presents the basis for the decision and provides information how environmental impacts will be avoided, minimized and/or compensated for.

SAFETEA-LU - Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users-Federal law approved on August 10, 2005 which in addition to providing federal funding for transportation projects, promoted more efficient and effective Federal surface transportation programs by focusing on transportation issues of national significance, while giving State and local transportation decision makers more flexibility for solving transportation problems in their communities.

SCDOT - South Carolina Department of Transportation

SLRCOG - Santee-Lynches Regional Council of Government

STIP - State Transportation Improvement Program: South Carolina's six-year transportation improvement program which identifies projects or program areas receiving federal funding which are anticipated to be undertaken during the upcoming six-year period. The STIP is updated every three years.