The government has constructed grade separators and flyovers at major intersections, and built Inner Ring Road and Outer Ring Road.[1][376] The Gemini flyover, built in 1973, crosses over the arterial road, and eases the traffic movements towards Anna Salai and towards the Kathipara Flyover.[375][376] As of 2011[update], according to the Transport Department, there were 25.8 lakh two–wheelers and 5.6 lakh four–wheelers in the city, and the Metropolitan Transport Corporation (MTC) bus fleet were 3,421, equaling 0.1% of all vehicles in the city.[377]