I guess the answer to that would be as long as they are necessary but no longer than necessary. As the title suggests, we want on an interim basis to have some flexibility, particularly with respect to the introduction of new technologies, whilst at the same time it being uppermost in our minds, of course, that safety is our main concern when new vehicles are introduced. We do feel that we need to provide some flexibility, hence these interim orders. However, it would only be for the time required to allow the necessary testing of these vehicles.
On September 26th, 2017. See this statement in context.