China has a hell of a plan for it's ferrries... invading Taiwan. Until the war begins, they will continue to carry out civilian transport along their routes.

as soon as China decides to invade Taiwan or another country, hundreds of amphibious vehicles will be loaded onto these ships along with troops. 

After that, these ships would approach the enemy coast to a designated distance and deploy amphibious forces directly into the sea to secure a foothold on the shore. These ships, being mainly commercial, are not equipped with defensive weapons, even though they may carry thousands of troops and hundreds of military vehicles. 

Taiwan, in turn, has a lot of anti-ship weapons, including anti-ship missiles.

https://en.defence-ua.com/news/why_china_arms_civilian_ferries_transporting_electric_cars_with_anti_aircraft_lasers-16707.html