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TAB’s primary task is to determine
how many people have the opportunity to
see a particular out of home sign. This
proprietary measure is referred to as
Daily Effective Circulation or DEC.
Currently TAB provides syndicated audits
covering the following types of out of
home media: Bulletins, 30 Sheet Posters,
Transit Shelters and Eight Sheets. TAB
also does custom audits for a limited
number of alternative media companies
including Truckside/Mobile, Postcard
Displays and Ski Area Displays.
TAB’s DEC’s provide a common currency
that can be used across all markets so
that media buyers and sellers can
compare and contrast their out of home
options with confidence. The current
DEC’s have been standardized using such
factors as seasonality, illumination,
passengers per vehicle and DOT growth
rates to form outdoors' basic
circulation measurement known as a DEC. | 
