I bet that at the end, you will find that it is still forbidden.
Either by Country law, by local law, by the law of the road operator, or by the law of the local police man stopping you.

Here in Taiwan, we went through the same, although on a smaller scale.
First, large displacement motorbikes were completely forbidden till the end of the 1990's.
Then, they were allowed to ride, but with rstrictions.
Even today, more then 10 years after opening up, motorbikes are still banned from using the expressways.
There is an experient going on with a small part of a expressway in the middle of the country open for big bikes, but no results or further action are heard of for the last 2 years.

In an democracy with an independent juridical system, you could create a case, be fined, and fight it in court.
But even here no one challenged the ban, and I doubt the procedure will work in the Middle Kingdom ...

Just my 2 cents.