Bus 115 (NT53) runs frequently between the airport and a stop on Zhongzheng Rd a couple blocks up from the train station.
For car hire call Central Auto (2254 7000; www.rentalcar.com.tw).
There are three bus companies serving the Taichung City area, which is confusing, but fortunately the visitor centre at the train station has information on them all. Renyou Bus Company buses have a red stripe at the front while Taichung Bus Company buses have a green stripe. UBus (2226 3034) buses are completely green. The usual fare for a single journey within the city is NT22.
Taichung Bus Company runs its buses from a station directly across from the train station and also from stops along Luchuan St, a block north of the train station. Renyou buses also run from stops along Luchuan St and the company has its office at 110 Luchuan St. The UBus station is across the street from the Kuo Kuang Hao station.