(a) whether the shortage of sand has pushed up the cost of building highways in the country and if so, the details thereof;
(b) whether the Government has devised any alternative mechanism to reduce the cost of building highways in the country and if so, the details thereof;
(c) whether there has been cost and time overrun in many National Highway projects in the country;
(d) if so, the details thereof during each of the last three years and the current year, State and project-wise;
(e) whether with the aim to minimize the cost overrun and delays in completion of highway projects the process of project preparation is being amended, if so, the details thereof; and
(f) the corrective measures taken by the Government to expedite the work on these projects?