| Road Type | Highway Code | Route | Speed Limit (Cars) | Speed Limit (Buses and Trucks) |
|---|---|---|---|---|
| National Highways | NH 4 | Chennai – Trichy – Madurai – Tirunelveli – Kanyakumari | 100 km/h (62 mph) | 80 km/h (50 mph) |
| NH 66 | Chennai – Bangalore | 100 km/h (62 mph) | 80 km/h (50 mph) | |
| NH 71 | Chennai – Salem – Coimbatore | 100 km/h (62 mph) | 80 km/h (50 mph) | |
| NH 81 | Chennai – Tiruchirapalli – Karur – Dindigul | 100 km/h (62 mph) | 80 km/h (50 mph) | |
| NH 79 | Chennai – Tirupati | 100 km/h (62 mph) | 80 km/h (50 mph) | |
| Expressways | Chennai Outer Ring Road (ORR) | Chennai | 100 km/h (62 mph) | 80 km/h (50 mph) |
| Madurai – Ramanathapuram Expressway | Madurai – Ramanathapuram | 120 km/h (75 mph) | 100 km/h (62 mph) | |
| Coimbatore – Salem Expressway | Coimbatore – Salem | 120 km/h (75 mph) | 100 km/h (62 mph) |
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