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(civil engineering)
A grade separation in which traffic at the higher level is raised, and traffic at the lower level moves at approximately its original level.
The upper level at such a grade separation.



a bridge built at the intersection of two or more main transportation arteries that allows for the free flow of traffic on different levels. Overpasses are commonly constructed where highways and railroads intersect or over city streets that have both heavy vehicular and passenger traffic.

An overpass can be either rectilinear or curvilinear, dependent on the type of intersection or the configuration of the intersecting city streets. Sometimes overpasses are arranged in several tiers and their spans are located one above the other. Most overpasses are either beam or frame structures because it is necessary to keep the spans low and because of the limited space that is available for piers; arch structures are comparatively rare. Currently, most overpasses are built from precast reinforced concrete. They usually consist of two to four spans, each 10–30 m long. Overpasses with more than four or five spans are called viaducts.

References in periodicals archive ?
Several officers of IVRCL, including site engineers working on the overpass, have been arrested.
Euler said the city considered replacing the overpass, but building a new structure was priced at almost $13 million.
Var of teams while taking preventive measures around the overpass
When the March 25 overpass video was posted, the backlash from chasers and meteorologists began almost immediately.
The dead included a woman who was driving a commuter bus that was trapped under the overpass, they said.
The overpass traverses a major thoroughfare and is almost four miles from the 58,170-seat Estadio Mineirao where the World Cup games are being played in Belo Horizonte.
The steel and concrete Washington Street (US-89) overpass in Montpelier, Idaho, built in 1971, was selected for this study.
Summary: TEHRAN (FNA)- Two freight trains collided at a rail intersection in rural Missouri, triggering the collapse of a highway overpass when at least a dozen rail cars derailed and struck a support pillar, authorities said.
was cited for failing to lower the liftgate on his trash truck yesterday after his vehicle hit an overpass on Route 20 east and flipped over.
Kurds try to overpass central government's rights, MP BAGHDAD/ Aswat al-Iraq: State of Law MP Shakir al-Daraji stated that the difference between the central government and the Kurdish region is the violation of the latter of the constitution over the first's authorizations.
Bulgaria's capital Sofia will have its first operational overpass road junction in July 2012, Sofia Mayor Yordanka Fandakova promised.
Three men have been hanged from a highway overpass in Kermanshah for killing three Bank Sepah guards at that site while stealing about 2.