 The deadline for completion of Phase 3 is 2016 . Out of 2 new lines and 11 route extensions proposed for Phase III , cabinet approvals have been obtained for 2 new lines and 10 route extensions totalling 167 @.@ 27 km , with an estimated cost of ₹ 350 billion ( US $ 5 @.@ 2 billion ) . Construction has already begun on many of these . In April 2014 the Delhi Lt. Governor gave approval for two further extensions . All the approved lines are : . 
