Glossary

23 CFR, Part 450

Title 23 Code of Federal Regulations, Part 450 is Federal regulations pertaining to statewide and metropolitan transportation planning. 

23 USC 134

23 United States Code 134 is the part of the USC that governs the metropolitan transportation planning process. 

3C

Employing a Continuing, Cooperative and Comprehensive (3C) planning process is a requirement for all MPOs as specified in 23 CFR 450.300. 

AADT

Average Annual Daily Traffic is a measure used primarily in transportation planning and transportation engineering. It is the total volume of vehicle traffic of a highway or road for a year divided by 365 days. 

Accessibility

Accessibility is the extent to which facilities are barrier free and useable by persons with disabilities, including wheelchair users.

ADA

The Americans with Disabilities Act is Federal legislation prohibiting discrimination on the basis of disability requiring accessible transportation services.

The Americans with Disabilities Act is a Federal law that requires public facilities, including transportation services, to be accessible to persons with disabilities, temporary disabilities and the conditions related to substance abuse. 

ADT

Average Daily Traffic is the average number of vehicles passing a specific point in a 24-hour period, often measured throughout a year, it is a standard measurement for vehicle traffic-load on a section of road and is used when making transportation planning decisions. 

Age Discrimination Act of 1975

The Age Discrimination Act of 1975 states that no person shall, on the basis of age, be excluded from participation in, be denied the benefits of or be subjected to discrimination under any program or activity receiving federal financial assistance. This act prohibits age discrimination in Federally Assisted Programs. 

CAA

The Clean Air Act is a United States federal law designed to control air pollution on a national level. It requires the Environmental Protection Agency (EPA) to develop and enforce regulations to protect the general public from exposure to airborne contaminants that are known to be hazardous to human health. 

CAAA

The Clean Air Act Amendments of 1990 is comprehensive federal legislation which establishes criteria for attaining and maintaining the federal standards.