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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. Structure gauge - Wikipedia

   en.wikipedia.org/wiki/Structure_gauge

   The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements with a recommendation of minimum clearance of 5 metres (16 ft 5 in). [2] In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3]

4. Roll-on/roll-off - Wikipedia

   en.wikipedia.org/wiki/Roll-on/roll-off

   The PCTC has liftable decks to increase vertical clearance, as well as heavier decks for "high-and-heavy" cargo. A 6,500-unit car ship, with 12 decks, can have three decks which can take cargo up to 150 short tons (136 t ; 134 long tons ) with liftable panels to increase clearance from 1.7 to 6.7 m (5 ft 7 in to 22 ft 0 in) on some decks.

5. Firewall (construction) - Wikipedia

   en.wikipedia.org/wiki/Firewall_(construction)

   Design loads – Fire wall must withstand a minimum 5 lb/sq ft (24 kg/m 2), and additional seismic loads. [7] Substation transformer firewalls are typically free-standing modular walls custom designed and engineered to meet application needs. Building fire walls typically extend through the roof and terminate at a code-determined height above it.

6. Lumber - Wikipedia

   en.wikipedia.org/wiki/Lumber

   Covering exposed ground in any crawl spaces with 6-mil polyethylene film and maintaining at least 12 to 18 inches (300 to 460 mm) of clearance between the ground and the bottom of framing members above (12 inches to beams or girders, 18 inches to joists or plank flooring members)

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8. Doctors Say This Viral "Sleep Rule" Actually Works - AOL

   www.aol.com/lifestyle/doctors-viral-sleep-rule...

   “There’s a lot of data that says the light disrupts the circadian rhythm and delays sleep onset,” says Dr. Sunderram. “It also inhibits melatonin, which is required for sleep onset.”

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