Voyants  has been appointed by NHAI to provide Independent Engineer Services for supervision of Construction and upgradation of NH – 131A from km 34.600 (design Ch: 6.000) near Narenpur to km 79.970 (design Ch: 53.000) near Purnea to 4 lane standard and from km 79.970 (design Ch: 53.000) to km 82.000 (design Ch: 55.000) near Purnea to 2 lanes with paved shoulders standard in Bihar on Hybrid Annuity Mode. Length – 49 km