World's Largest Road Networks: U.S. #1, China #2

By total public road length (paved + unpaved):

1. United States: ~6.8 million km (4.2 million mi)
2. China: ~5.3 million km (3.3 million mi) — surpassed India (~6.4M km including rural tracks) in total *paved* network length (~5.2M km vs. US ~4.3M km).
3. India: ~6.4 million km (includes vast rural/unsurfaced); paved ~4.5M km.

Nuance Matters

• Paved vs. total: China leads in expressways (~170,000 km) and national highways; U.S. leads in total lane-miles and rural coverage.
• Density: Japan, France, Germany have higher km/km².
• Growth: China added ~300,000 km/year (2010–2020); U.S. network is mature, focused on maintenance.

Sources

World Bank (World Development Indicators), CIA World Factbook, national transport ministries. Definitions vary—compare like-with-like.