Eighteen state governments on 13 April 2010 signed Umbrella State Support Agreement (SSA) with the Union Ministry of Shipping, Road Transport and Highways. The SSA was countersigned by the NHAI.

The states that signed the pact include Andhra Pradesh, Arunachal Pradesh, Assam, Chhattisgarh, Punjab, Haryana, Himachal Pradesh, Jharkhand, Maharashtra, Madhya Pradesh, Manipur, Meghalaya, Nagaland, Rajasthan, Tripura, Uttarakhand, West Bengal and Chandigarh.

The signing of SSAs is likely to expedite road projects under the NHDP through PPP mode. Karnataka, Kerala, Jammu & Kashmir and Orissa have also conveyed their willingness to sign the pact soon.

A total of 23 states had given their consensus for the agreement. However, Uttar Pradesh, Orissa, Gujarat, Bihar and Tamil Nadu have refrained from signing the SSA.

The Umbrella SSA is a single agreement that entitles the state government to support and facilitate the Union Government in land acquisition, law and order and security in every highway project across the state.