Union Minister Nitin Gadkari on Friday called upon investors to take up road projects as they offer" very high" internal rate of return, ensuring their economic viability. Assuring investors that their investments are safe, the road transport and highways minister said the possibility of any project getting stalled is nil now." The internal rate of return in the road sector is very high and so there is no need to worry about their economic viability," Gadkari said while addressing a national con