Leeway (posting): A grace period that allows an outdoor media provider time to complete a posting without penalty in the event of delay caused by weather or unforeseen circumstances.

Line: The side of an expressway or arterial on which an outdoor media unit is positioned.

Line of sight: Direction from which an outdoor media structure can be viewed. A given structure may have more than one line-of-sight.

Line of travel: The center of the lane of traffic moving in one direction.

Lithography: Printing method that produces large quantities of Poster paper in full color.

Load factor (vehicle load factor): The average number of persons riding in each vehicle. Determined trough national, syndicated and government research reports.

Location codes: Letters used to designate the location of an outdoor media structure on a street. Standard abbreviations used are: E/L east lane; W/L west lane; N/L- north lane; S/L -south lane; E/F east facing; W/F west facing; N/F North facing and S/F south facing.

Location list: A list describing the location of all outdoor media structures sold. It is common industry practice for the posting manager to certify the list.

Location map: A map of the market indicating the locations of the outdoor media structures for a specific GRP.