THIRUVANANTHAPURAM: The National Highways Authority of India (NHAI), revenue department, and Bhopal-based ‘Highway Engineering Consultant’ has started laying the boundary stones as part of the land acquisition procedures for the construction of the proposed Outer Ring Road (ORR) in the state capital. The proposed 77-kilometre road will start from Vizhinjam and end at Navaikulam near the Kollam border. Though the stone-laying procedures started last week, no protests have been held so far among the residents.