Do not overload the brain box
Texting is much less difficult if done by Morse Code.
It appears that the handicap due to vocal communication is poor multitasking.
As a precaution, then, substantive and immersing intellectual content, or content arousing of emotion, must be forbidden from being aired during commute hours, and at night when truck (lorries to you) drivers are racing down deserted roads to meet deadlines.
Lunchtime (as we say) should similarly be restricted to light and nonabsorbing content as well, protecting those who must drive from the workplace to an eating-place and back.
Or just ban the airing duringcritical times of intellectually and emotionally interesting content by such stations as still have any. "Talk Radio" is included in this category, so that's some good to come of this.
It is, however, not necessary to actually test drivers, as establishments of low type abound wherein test subjects might be set tasks on tablets or laptop computers while being assailed by the sensory blandishments such places are reputed to offer.
More research is obviously needed.
Paris. I don't know why.