Union Minister Nitin Gadkari on Monday launched national highways and waterways projects worth more than Rs 3,400 crore during his day-long visit to East Champaran and West Champaran districts of Bihar. Gadkari, who holds road transport and highways, and shipping, water resources, river development and Ganga rejuvenation portfolios, also addressed the concluding ceremony of a three-day farmers’ conclave in Motihari, the district headquarters of East Champaran.