Highways in Taiwan are classified into five types:
| Level | Name | Chinese | Taiwanese Mandarin | Taiwanese Hokkien | Taiwanese Hakka | Numbers | Notes |
|---|---|---|---|---|---|---|---|
| 1 | National Highways | 國道 | Guódào | Kok-tō | Koet-tho | 1–10 | Labeled as Freeway |
| 2 | Provincial Highways | 省道 | Shěngdào | Séng-tō | Sén-tho | 1–39, 61–88 | The latter are labeled as Expressway |
| 3 | County and City Highways | 縣道、市道 | Xiàndào, Shìdào | Koān-tō, Chhī-tō | Yen-tho, Sṳ-tho | 101–205 | |
| 4 | Township and District Roads | 鄉道、區道 | Xiāngdào, Qūdào | Hiong-tō, Khu-tō | Hiông-tho, Khî-tho | ||
| 5 | Special Roads | 專用公路 | Zhuānyòng Gōnglù | Choan-iōng Kong-lō͘ | Chôn-yung Kûng-lu |
The system does not apply to other parts of Taiwan, namely Kinmen and Lienchiang counties, and islands in the South China Sea.
Expressways in Taiwan may be controlled-access highways similar to National Freeways or limited-access roads. Most have urban roads and intra-city expressways (as opposed to Highway system) status, although some are built and maintained by cities.