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2. Clearance (civil engineering) - Wikipedia

   en.wikipedia.org/wiki/Clearance_(civil_engineering)

   In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.

3. Loading gauge - Wikipedia

   en.wikipedia.org/wiki/Loading_gauge

   The clearance space between a train and the tunnel is often small. Pictured is a London Underground Northern line 1995 Stock train emerging from the tunnel north of Hendon Central station. A loading gauge is a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads.

4. List of bridges in the United States by height - Wikipedia

   en.wikipedia.org/wiki/List_of_bridges_in_the...

   A bridge's deck height is greater than its clearance below, which is measured from the bottom of the deck structure, with the difference being equal to the thickness of the deck structure at the point with the greatest clearance below. Official figures for a bridge's height are often provided only for the clearance below, so those figures may ...

5. Automated parking system - Wikipedia

   en.wikipedia.org/wiki/Automated_parking_system

   In this case study, the APS also provides roughly 7,000 sq ft (650 m 2) of additional open space compared to the multi-story parking garage which provides no open space and requires minimum setbacks be utilized. Other references also indicate that the cost comparison between APS and multi-story parking garages is highly dependent on the ...

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7. Deck (building) - Wikipedia

   en.wikipedia.org/wiki/Deck_(building)

   The deck of a house is generally a wooden platform built above the ground and connected to the main building. It is generally enclosed by a railing for safety. Access may be from the house through doors and from the ground via a stairway. Residential decks can be constructed over steep areas or rough ground that is otherwise unusable.

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9. Lumber - Wikipedia

   en.wikipedia.org/wiki/Lumber

   As previously noted, less wood is needed to produce a given finished size than when standards called for the green lumber to be the full nominal dimension. However, even the dimensions for finished lumber of a given nominal size have changed over time. In 1910, a typical finished 1-inch (25 mm) board was 13 ⁄ 16 in (21 mm). In 1928, that was ...