"The arrestee was released on bail and is required to report back to police in early March."
"The electric scooter has not been legalised for driving on Hong Kong roads so far," one local news site reported.
A traffic investigation unit in Kowloon East was in charge of the matter.
The Hong Kong 01 website said Tseung Kwan O tunnel staff alleged an electric scooter entered the tunnel towards Kwun Tong at 2 pm on Monday.
After recording the man's details, tunnel staff reportedly arranged a car to return him and his scooter to Tseung Kwan O.
New Zealand's Ministry of Foreign Affairs and Trade has been approached for comment.