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A spare wheel cover or spare tire cover is an accessory that covers the spare wheel mounted on external part of a car or van. On 4x4 vehicles, the spare wheel is normally rear mounted and is often printed with a design. Covers can be hard shells or soft vinyl covers.
A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights. The term operable skylight, while quite similar, refers to a skylight that opens on a hinge, rather than on a ...
The trailer tongue (North America) or coupling (outside North America) slips over a trailer hitch ball attached to a receiver hitch mount or integral with the hitch. A larger, heavy-duty gooseneck ball size: 3 in (76.2 mm) is typically used for towing greater than 10,000 pounds (4.5 t), and this towing capacity falls outside of the scope of SAE ...
These materials can be ejected from the tire's surface at high velocity as the tire imparts kinetic energy to the attached objects. For a vehicle moving forward, the top of the tire rotates upward and forward and can throw objects into the air at other cars or pedestrians in front of the vehicle. In British English, the fender is called the ...
Tunnel Construction. Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management.
A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
The tunnel is 14.5 feet (4.4 m) high, but is restricted to vehicles with a maximum clearance of 14 feet (4.3 m). [46] In addition to the tunnel, the project included the construction of 16 overpasses, 15 ramps, and 23 retaining walls, plus landscaping, drainage, and the installation of variable-message signs. [3]
The floor of the tunnel is constructed of 1,800 texturized concrete panels, each 7.5 by 8 feet (2.29 by 2.44 m), with the railroad tracks sunken slightly below the road surface. [15] The interior is exposed rock, and contains several "safe-houses", which are small buildings that are used in case of severe earthquakes, vehicle fires, or other ...