Road TypeHighway CodeRouteSpeed Limit (Cars)Speed Limit (Buses and Trucks)
National HighwaysNH 4Chennai – Trichy – Madurai – Tirunelveli – Kanyakumari100 km/h (62 mph)80 km/h (50 mph)
NH 66Chennai – Bangalore100 km/h (62 mph)80 km/h (50 mph)
NH 71Chennai – Salem – Coimbatore100 km/h (62 mph)80 km/h (50 mph)
NH 81Chennai – Tiruchirapalli – Karur – Dindigul100 km/h (62 mph)80 km/h (50 mph)
NH 79Chennai – Tirupati100 km/h (62 mph)80 km/h (50 mph)
ExpresswaysChennai Outer Ring Road (ORR)Chennai100 km/h (62 mph)80 km/h (50 mph)
Madurai – Ramanathapuram ExpresswayMadurai – Ramanathapuram120 km/h (75 mph)100 km/h (62 mph)
Coimbatore – Salem ExpresswayCoimbatore – Salem120 km/h (75 mph)100 km/h (62 mph)
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