TOI has learnt that the projects include 68-km Ayodhya Bypass, 121-km Guwahati Ring Road, 516-km Kharagpur-Siliguri expressway, 6-lane Agra Gwalior greenfield highway (88 km) and an 30-km long elevated highway having eight lanes between Nasik and Khed (Pune). All the projects will be built on public private partnership (PPP) mode, sources said. NHAI has invited bids for most of these projects and has held rounds of meetings with highway developers to elicit more interest among them.