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  2. Light tube - Wikipedia

    en.wikipedia.org/wiki/Light_tube

    The pipe is coated with a 99.3% specular reflective film and the distribution element at the end of the light pipe consists of a 4.6 m long diffusing radial film with an 87% visible transmittance. The light pipe introduces consistently illuminance levels ranging between 300 and 2,500 lux throughout the year at distances between 7.6 m to 10 m. [12]

  3. Double-stack rail transport - Wikipedia

    en.wikipedia.org/wiki/Double-stack_rail_transport

    A 20-foot (6.1 m) container is limited to 24 tonnes (26.5 short tons; 23.6 long tons) and two such can fit into a car for a 40-foot (12.2 m) container, or even three if double-stacking [citation needed], but not four unless very high axle load is permitted. The North American railways permit two 53-foot (16.15 m) containers as shown in the ...

  4. Metropolitan Area Outer Underground Discharge Channel

    en.wikipedia.org/wiki/Metropolitan_Area_Outer...

    [2] [3] It consists of five concrete containment silos with heights of 65 metres (213 ft) and diameters of 32 metres (105 ft), connected by 6.4 kilometres (4.0 mi) of tunnels, 50 metres (160 ft) beneath the surface, as well as a large water tank with a height of 25.4 metres (83 ft), with a length of 177 metres (581 ft), with a width of 78 ...

  5. Eisenhower Tunnel - Wikipedia

    en.wikipedia.org/wiki/Eisenhower_Tunnel

    In 2007, the tunnel was retrofitted with lower-profile lighting and signs, increasing its clearance by 5 in (13 cm) to 13 ft 11 in (4.24 m). [5] A height detector near each tunnel entrance sounds a siren and turns traffic signals red, stopping all traffic, if an overheight vehicle attempts to enter the tunnel.

  6. Queen Creek Tunnel - Wikipedia

    en.wikipedia.org/wiki/Queen_Creek_Tunnel

    The new tunnel was cut through the solid rock of the Queen Creek gorge, approximately 3 miles (4.8 km) from the 4,625-foot (1,410 m) mountain summit. [3]. It is 22 feet (6.7 m) in height and 42 feet (13 m) wide at its base. [4] The cost of the tunnel at the time of its construction was $550,000 [5] and it was built by the Fisher Contracting ...

  7. Loading gauge - Wikipedia

    en.wikipedia.org/wiki/Loading_gauge

    Some of the new railways being built in Africa allow for double-stacked containers, the height of which is about 5,800 mm (19 ft 0 in) depending on the height of each container 2,438 mm (8 ft 0 in) or 2,900 mm (9 ft 6 in) plus the height of the deck of the flat wagon about 1,000 mm (3 ft 3 in) totalling 5,800 mm (19 ft 0 in).

  8. Lightwell - Wikipedia

    en.wikipedia.org/wiki/Lightwell

    In architecture, a lightwell, [NB 1] sky-well, [NB 2] or air shaft is an unroofed or roofed external space provided within the volume of a large building to allow light and air to reach what would otherwise be a dark or unventilated area. Lightwells may be lined with glazed bricks to increase the reflection of sunlight within the space.

  9. East River Mountain Tunnel - Wikipedia

    en.wikipedia.org/wiki/East_River_Mountain_Tunnel

    The northern 51% of the tunnel is in West Virginia and the southern 49% in Virginia; Virginia shared the cost of the project. [ 2 ] Before the opening of the East River Mountain Tunnel, travelers wishing to cross the state line had to navigate the narrow, twisting, guardrail-less route of US 52 up and over the mountain (now designated as SR 598 ...

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