Gurugram, March 31 -- The National Highways Authority of India (NHAI) has revised toll rates across key highways in Gurugram, including the Delhi-Gurgaon Expressway, Dwarka Expressway and Sohna Highway, with the new charges set to take effect from midnight of March 31, officials said. NHAI officials said the hike is part of an annual revision linked to the Wholesale Price Index (WPI). "The toll fees revision is an annual exercise, and the change is linked with the Wholesale Price Index (WPI). The fee hike will be applicable from April 1," said a senior NHAI official, asking not to be named. At the Kherki Daula toll plaza, fees for cars, jeeps and vans have increased from Rs.80 to Rs.100 per trip, while return trips will cost Rs.150. Meanwhile, a monthly pass for 50 single trips is priced at Rs.3,320 and Rs.350 for personal vehicles registered within 20 km. According to officials, commercial vehicles registered within the district will pay Rs.50 per trip, while trucks and buses will be charged Rs.335 per trip or Rs.11,240 for a 50-trip monthly pass. The plaza sees around two lakh vehicles daily, with nearly 70,000 paying a toll. At the Bijwasan toll plaza on the Dwarka expressway, the car toll has been raised from Rs.220 to Rs.225 per trip, with return charges increasing from Rs.330 to Rs.340. A 50-trip pass will cost Rs.7,550, up from Rs.7,360, officials said. Local residents within 20km can avail themselves of a Rs.350 monthly pass. Commercial vehicles registered within the district will pay Rs.114 per trip. Trucks and buses will be charged Rs.765 per trip and Rs.1,160 for return journeys, while those registered within the district will pay Rs.385 per trip, officials added. NHAI officials said tolling on the Dwarka expressway began in November last year, with around one lakh vehicles using the route daily. Traffic has increased following its connectivity to Urban Extension Road 2 (UER2), they added. On the Sohna highway at the Ghamdoj toll plaza, cars, jeeps and vans will pay Rs.130 per trip or Rs.195 for return journeys within 24 hours, officials said. Light commercial vehicles will be charged Rs.210 per trip, buses and trucks Rs.440, heavy machinery Rs.690, and oversized vehicles Rs.845 per trip, they added. Officials were unable to confirm the current rates for this plaza....