The correct answer is Chennai - Ennore State Highway.

In news,

• The five-phase 133 km Peripheral Road for which land is being acquired will address the rapidly increasing road traffic demand in the Chennai Metropolitan Area.
• The project is expected to improve the connectivity in and around Chennai by formulating the radial-ring road network in collaboration with other ring roads such as Inner Ring Road, the Chennai Bypass, and Outer Ring Road to provide alternative routes for traffic as well as improve the road network.
• It will also provide direct access to Ennore Port and Kattupalli Port from industrial clusters located in suburban areas of Chennai Metropolitan Area to accelerate industrial and economic growth.​

• Six State Highway roads of about 452-km length have been upgraded as National Highways in Tamil Nadu in 2017.
  • The roads declared as NH are Thoppur Mettur-Bhavani-Erode (85 km).
  •  Salem-Thirupattur-Vaniyambadi (141.0 km),
  • Athur-Perambalur (55.4 km), T
  • irupur-Oddanchatram road (90.8),
  • Chengalpattu-Mahabalipuram (29 km) and
  • Kodaighat-Kodaikanal (52 km)
  • 125 km Vaniyambadi- Salem stretch was part of State highways until 2017 but It handed over to NH due to over traffic.