Some if you may be interested to know that the knew comprehensive road maps from the publishing company 所外生活 (Outdoor Life) have come out recently.
The new A series replaces the B series which has been out of print for Northern Taiwan for a year or two. I’ve been waiting for this for a while.
These maps are the best I’ve seen. They basically have maps for all areas arranged in a practical grid format. There are books A1(I think) is Northern Taiwan (basically greater Taipei), then another for Taoyuan/Xinzhu/Miaoli, one for Eastern Taiwan, etc.
(Chinese only of course).