Tunnel, Traffic

Tunnel, Traffic


a tunnel built at the intersection of heavily traveled urban traffic arteries to allow various types of vehicles to cross the intersection at different levels (see). Special structures or sections of roadway may be provided to allow pedestrians to cross traffic arteries (seePEDESTRIAN CROSSING). The placement of traffic tunnels is coordinated with the system of urban traffic circulation, the planning of streets and construction along them, and the installation of underground cables and sewers.

A traffic tunnel usually has a two-grade profile. As a rule, such a tunnel consists of one enclosed (tunnel) section and two open (ramp) sections that provide for the flow of traffic in two directions. Three lanes in each direction are customary in the USSR.

Traffic tunnels are constructed at a shallow depth and most often in open trenches. The enclosed section of a traffic tunnel is usually made of precast reinforced concrete in the form of a closed, two-bay frame. The open (ramp) sections consist of retaining walls, reinforced-concrete foundation blocks, and a drainage chute, which are combined into a single structural system by concreting the joints. Traffic tunnels are protected against water penetration by a waterproof lining. A reinforced-concrete framework is cast along the upper parts of the ramp walls and serves as a base for a parapet. Lampposts and the supports for trolley-bus power lines are usually installed on the parapet.


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References in periodicals archive ?
Under different traffic conditions (such as in a tunnel, traffic jam or normal traffic) the system provides the vehicle occupants with clean air for the lowest possible drain on energy.
Design services includes new conduit, wire, panels, fixtures and photocell, new pad-mount illumination control cabinets and connections, replacement of flashing yellow beacons, evaluation and possible replacement of luminaire pole on downtown outside tunnel, evaluation of other illumination needs outside the tunnel, traffic control and/or detours during illumination work, installation of a variable message sign south of the tunnel on a new cantilever sign structure.
In addition, professional expertise is wanted for road, bridge, tunnel, traffic, noise, GIS and architecture.
Tenders are invited for Repair/Maint Of Tunnel, Traffic, Focus, Perimeter Light Fittings, Provn Of Drain Near New Echs, Provn Of Addns/Altns To Bldg No T-540 And Provn Of Store Room And Allied Wks In 1803 Pnr Unit, At Fort William, Under Ge (Fw) Kolkata
The area is to beplanen in terms of roads, drainage, including major collectors, ramp to Wasen Tunnel, traffic routing over the construction period, including LSA-control, the busbar are to be integrated.
Contract notice: Am domhof tunnel, traffic hardware (dom 3).