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Longer bridges can reduce the width of both shoulders to 4 feet (1.2 m). Existing bridges can remain part of the Interstate system if they have at least 12-foot-wide (3.7 m) lanes with 3.5-foot (1.1 m) shoulder on the left and a 10-foot (3.0 m) shoulder on the right, except that longer bridges can have 3.5 feet (1.1 m) shoulders on both sides.
In South Africa and the southern region of Africa, the minimum vertical clearance of modern bridges is 5 metres (16 ft 5 in), although the legal height limit of road vehicles is still at 4.3 metres (14 ft 1 in). [7] United Kingdoms has a standard on minimum clearance of a public highway at 16 feet 6 inches (5.03 m).
Standard-gauge Rail Baltica railway is under construction and is scheduled to be completed by 2026. Cost studies have been undertaken for a potential overhaul of entire rail network to standard gauge. [41] Ethiopia: Addis Ababa-Djibouti Railway; Addis Ababa Light Rail: 659 km (409 mi) Other standard gauge lines under construction. Finland
The ISO 668 standard has so far never standardized 10 ft (3 m) containers to be the same height as so-called "Standard-height", 8 ft 6 in (2.59 m), 20- and 40-foot containers. By the ISO standard, 10-foot (and previously included 5-ft and 6 1 ⁄ 2 -ft boxes) are only of unnamed, 8-foot (2.44 m) height.
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).
Half-height platform edge doors, also known as automatic platform gates, are cheaper to install than full-height platform screen doors, which require more metallic framework for support. Some railway operators may therefore prefer such an option to improve safety at railway platforms and, at the same time, keep costs low and non-air-conditioned ...
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Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. [7] Bar gates are frequently paired end to end or closely offset to block traffic in both directions. Some bar gates also have a second arm which hangs 30 to 40 cm below the upper arm when lowered to increase approach visibility.
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