| Grade-A Expressways (G-Series Tollways) | 100 – 120 km/h | 85 – 100 km/h | 1.15x – 1.25x | 450 – 600 km | Sectional speed cameras, tunnel 80 km/h decelerations, toll plaza merging, mandatory 20-min rest stops every 4 hours. |
| Lowland National Highways (Flat G-Roads) | 70 – 80 km/h | 50 – 65 km/h | 1.40x – 1.60x | 280 – 380 km | Agricultural tricycles, township zebra crossings, traffic lights every 3 km, slow-moving heavy freight transport. |
| Plateau & Alpine National Highways (G318, G214, G227) | 40 – 70 km/h | 35 – 48 km/h | 2.10x – 2.60x | 200 – 280 km | Continuous switchbacks, altitude fatigue above 3,500m, cattle herds, slow-climbing trucks on 8% gradients. |
| Remote Frontier & Desert Corridors (G219, G315, Tarim) | 60 – 80 km/h | 45 – 60 km/h | 1.70x – 2.00x | 300 – 420 km | Wind-blown sand dunes, long stretches between fuel depots (250+ km), security checkpoints requiring passport scanning. |
| Highland Scenic Secondary Roads (S-Roads, Mountain Passes) | 30 – 50 km/h | 25 – 35 km/h | 2.80x – 3.50x | 120 – 180 km | Single-lane unpaved segments, sheer cliffs without guardrails, unpredictable rockfalls, blind convex mirror cornering. |