▁of ▁which ▁ ▁is ▁on ▁the ▁G Q . ▁This ▁phase ▁is ▁entirely ▁on ▁a ▁DB FO ▁basis . ▁ ▁Ph ase ▁VI : ▁This ▁phase , ▁approved ▁in ▁November ▁ 2 0 0 6 , ▁will ▁develop ▁ ▁of ▁express ways ▁at ▁an ▁estimated ▁cost ▁of ▁IN R ▁ 1 6 7 ▁Bill ion . ▁ ▁Ph ase ▁VII : ▁This ▁phase , ▁approved ▁in ▁December ▁ 2 0 0 7 ▁will ▁develop ▁ring - ro ads , ▁by pass es ▁and ▁fly o vers ▁to ▁avoid ▁traffic ▁bott l ene cks ▁on ▁selected ▁st ret ches ▁at ▁a ▁cost ▁of ▁IN R ▁ 1 6 7 ▁Bill ion . ▁ ▁N HA I ▁helps ▁in ▁implementing ▁Special ▁Acc eler ated ▁Road ▁Development ▁Program me ▁for ▁North ▁Eastern ▁Region ▁( S AR DP - NE ); ▁a ▁project ▁to ▁upgrade ▁National ▁High ways ▁connecting ▁state ▁capit als ▁to ▁ 2 ▁lan es ▁or ▁ 4 ▁lan es ▁in ▁the ▁north - e astern ▁region . ▁ ▁Golden ▁Qu ad ril ater al ▁The ▁Golden ▁Qu ad ril ater al ▁is ▁a ▁highway ▁network ▁connecting ▁many ▁of ▁the ▁major ▁industrial , ▁agricult ural ▁and ▁cultural ▁cent res ▁of ▁India . ▁ ▁A ▁quad ril ater al ▁of ▁sorts ▁is ▁formed ▁by ▁connecting ▁Chen na i , ▁Kol k ata , ▁Del hi ▁and ▁M umb ai , ▁and ▁hence ▁its ▁name . ▁The ▁largest ▁highway ▁project ▁in ▁India ▁and ▁the ▁fifth ▁longest ▁in ▁the ▁world ▁was ▁launched ▁in ▁ 2 0 0 1