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an open field fortification with two faces at an angle of 60°-120° to each other, protruding in the direction of the enemy. Small redans with blunt angles are called flèches.

In the 18th and 19th centuries, redans were built not only as separate fortifications, but also as continuous fortifications by connecting a series of redans with straight segments. Trenches with redan-type outlines were common in the fortified positions of most armies during World War I.

ravelin, demilune

In fortifications, a projecting outwork forming a salient angle.
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Performance measures calculated by REDARS include congestion and delay times.
Refining the REDARS program's current loss estimation methodologies is included, along with providing a comprehensive assessment tool to measure highway resilience.
Therefore, beginning in the late 1990s, FHWA sponsored multiyear seismic research projects for developing and programming REDARS (Risks from Earthquake DAmage to Roadway Systems) software, released for public use in 2006.