encyclopedia

MAJOR ACTIVITY CENTER (MAC, ACTIVITY CENTER)

A geographical area characterized by a large transient population and heavy traffic volumes and densities; for example, central business district, major air terminal, large university, large shopping center, industrial park, sports arena. (TRB)

MAJOR ACTIVITY CENTER TRANSIT SYSTEM (MAC SYSTEM)

A transit system that provides service for short trips within small, densely populated major activity centers, such as shopping centers and downtown areas. (TRB)

MAJOR DEFECT

A defect other than critical, that is likely to result in failure or reduce materially the usability of the unit or product for its intended purpose.

MAJOR INVESTMENT STUDY (MIS)

A Major Investment Study was required under the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991. However, the Transportation Equity Act for the 21st Century repealed this requirement in 1998. The MIS is intended to consider in detail a greater…

MAJOR STREET

An arterial highway that has intersections at grade and gives direct access to abutting property. Geometric design and traffic control measures are used to expedite the safe movement of through traffic. (TRB)