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Other systems use retractable cones or bollards which are built into the road, or retractable fences which can divert traffic from a reversible ramp. The two center lanes of the six-lane Golden Gate Bridge are reversible; they are southbound during morning rush hour and northbound at evening rush hour.
Bollards may also be used to enclose car-free zones. Bollards and other street furniture can also be used to control overspill parking onto sidewalks and verges. [11] Bollards can be temporary and portable, such as this traffic control bollard separating the road from the worksite.
A retractable bridge is a type of moveable bridge in which the deck can be rolled or slid backwards to open a gap while traffic crosses, usually a ship on a waterway. This type is sometimes referred to as a thrust bridge. The bridge is retracted to the right. Borden Avenue Bridge, Long Island City. Retractable bridges date back to medieval times.
Pages in category "Retractable bridges" The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes. ...
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Stanchions and velvet rope. A stanchion (/ ˈ s t æ n tʃ ən /) is a sturdy upright fixture that provides support for some other object. [1] It can be a permanent fixture. In nautical terms, the stanchion is the thick and high iron that with others equal or similar is placed vertically on the gunwale, stern and tops.
Tetrapods on Graciosa Island, Azores Tetrapods in Latvia Tetrapods protecting a marina on Crete, Greece.. A tetrapod is a form of wave-dissipating concrete block used to prevent erosion caused by weather and longshore drift, primarily to enforce coastal structures such as seawalls and breakwaters.
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 ...