The new type has a subbase system that helps prevent injuries, she added.
From the dailyherald.com
A two-layered drainage system is installed below the Polytrack material and above the track's subbase.
From the signonsandiego.com
A binding agent may be mixed in to form a base course for the new pavement, or it may be left unbound to form a subbase course.
From the en.wikipedia.org
It can then be transported to an asphalt or concrete plant and incorporated into new pavement, or recycled in place to form the base or subbase for new pavement.
From the en.wikipedia.org
Momote airfield was found to have been constructed on a coral subbase with an overburden of coconut palm humus, over which the Japanese had laid a thin layer of coral and coral sand.
From the en.wikipedia.org
Geotechnical engineers design the pavements in terms of the subgrade, subbase, and base layers of materials to be used, and the thickness and composition of each.
From the en.wikipedia.org
More examples
The lowest molding of an architectural base or of a baseboard
In topology, a subbase (or subbasis) for a topological space X with topology T is a subcollection B of T which generates T, in the sense that T is the smallest topology containing B. ...
In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located. It may be omitted when there will be only foot traffic on the pavement, but it is necessary for surfaces used by vehicles.
(subbasement) A basement located beneath another basement
A portion of a base, usually consisting of a single axial polygon.
Commonly made from stone pieces, larger than that in the base materials. It is a layer of particular thickness, placed on a subgrade, giving support to the base material.
The course in the Pavement Structure immediately below the Base Course. If the Subgrade soil has adequate support, it may serve as the Subbase.
A layer used in a pavement system between the subgrade and base course, or between the subgrade and portland cement concrete pavement.
The layer of material placed to furnish strength to the base of a road.