@ghinavirus Like most things 2042 as of this writing the answer is unclear. However, there was a tweet from a dev a few months back about how they loved the fact that they can use the Tuk Tuk to move around different areas of the Training Range as well as reports from some players of the greybox test who said that they glitched into what appeared to be a training area.
With the announcement of Portal though even if we don't get a dedicated Test Range we'll still effectively have an unofficial one where you can just create a server and test what you need to in peace (assuming you get access to vehicles with only one player in the server)