Efforts to concretise Mumbai's roads faced hurdles after a few contracts were cancelled as the contractors failed to meet certain requirements, said Maharashtra industries minister Uday Samant on Wednesday.

Replying to questions by members of legislative council (MLCs) Sunil Shinde and Vilas Potnis in the Upper House of the state legislature here, he said that in the first of the concretisation project, tenders for 910 roads, having a total length of 397 km, were floated.