OK, is there a highway or a ferry service link that operates between Hainan Island and the Mainland?

Such that the link would be provided between Haikou, Hainan and Xucheng, Guangdong.

no highway, but there are ferry services.

But are there plans for building a highway link for that, even though it will cost billions of dollars and 3 years of construction?

But are there plans for building a highway link for that, even though it will cost billions of dollars and 3 years of construction?

i will get back to you after i have the minister of construction write up a feasibility report and a budget.

You can book through train trips. I've heard that the train itself boards a ferry, but I'm not sure of that.