Originally Posted by
Happy
That is great news because now you can use high speed rail from Kowloon West, and the Hong Kong-Zhuhai-Macao Bridge. In this case essentially one can travel among HKG/China/MFM frequently with much less trouble and cost. It is a very sensible move on the China side.
If you do that more than two times, you'll end up spending more (additional v HK-China-HK) money than you would for a visa and wasting tons of time in the process. I'm guessing the Chinese didn't give much thought to that type of traveler when they designed and implemented 240-hour TWOV.