This is a bilevel Metro viaduct where Chennai Metro Corridors 4 and 5 converge, with five tracks supported by a single set of pillars across two levels. The fifth track is a sloping loop line that will connect Corridors 4 and 5.

The viaduct spans roughly 4 km along Arcot Road between Alwarthirunagar and Alapakkam.

The lower level costs Corridor 4 (Lighthouse to Poonamallee), while the upper level hosts Corridor 5 (Madhavaram to Sholinganallur).