About Rs 1,20,036 Lakh crore have been spent on the development of national highways during the last three financial years 2013-14, 2014-15 and 2015-16," Minister of State for Road, Transport and Highways Pon Radhakrishnan told Lok Sabha. A total of Rs 71,517 crore was spent by the private sector on national highways construction under PPP mode during the last three years.