I am no expert in Chinese transportation laws and regulations. But I wouldn't say it's a lax environment there - it's more ad hoc to be more accurate as I've seen regulation coming out from time to time in response to events.

On the other hand, Shenzhen is the world capital of electronic / hardware components sourcing, manufacturing & production. Geohot's trip to Shenzhen may or maynot be an indication of his intention of releasing comma one in China but rather an expected visit to check up his product manufacturing.

Also, perhaps Cruise have already been dealing with government agencies and perhaps in compliance of regulatory requirements so that we don't hear about same trouble for Cruise.