When you press "test speedcams"[with TTs voice selected], it will only say speedcamera ahead, or XXXXahead depending what icon you press.

It will say the speed and distance[when navigating] provided you have turned them on in settings.

The phrase that it says is in the dictionary file of the selected voice, which can be found in "content/voice"

Any spoken speech can be changed to the phrase of your choice by editting this dictionary file.