It would appear speaking into Siri or other applications that do speech to text hasn't been studied enough to make a final decision, but I think it's going to end up OK. This study is a piece of garbage though and falls into bad research, as the software wasn't used as intended in the car.
The only valid study would evaluate the software being used as it is typically used, regardless of the manufacturers intent.
The research is still valid in the sense that most people probably have no idea about "car mode" and "no-eyes" mode.
Hmmm, seems a little shallow to claim the research is valid when it blames the device for ignorance of the operator.
The real problem is something like 60 or 70% of the people have given up on SIRI all together because it just doesn't work all that well.
Except it doesn't blame the device for the ignorance of the operator. The ignorance of the operator is already a given -- they're texting while driving, or trying to do the equivalent thinking that the way they (mis)use Siri makes it safer to text. That they additionally are ignorant of the different modes only further supports the idea that texting while driving (regardless of how it is done) is generally less safer than not texting. At worst, they would simply need to modify it to say that "the way most people use voice-activated texting is no safer than typing" as opposed to just "voice-activated texting is no safer than typing." I would argue the former is rather redundant.