Main opposition party in Tripura, TMP is demanding 'Greater Tipraland' or a separate state for the tribals under Articles 2 and 3 of the Constitution, would blockade the NH-8 on Wednesday and the party’s supremo and former royal scion Pradyot Bikram Manikya Deb Barman would launch for a fast unto death hunger strike soon if the Centre does not accept his party's demands at the earliest.