A quick google search doesn't show anything. Anyway, here's a good article
>>A quick google search doesn’t show anything. Anyway, here’s a good article<<
Other than an anecdote that is MUCH less reliable than my very specific example, the opinion of a “hard of hearing” site blog is as useful as an article about obozo on KOS or DU.
Your own research (I did more than you did) reveals what I said — the only tests were done in the 1960s and 1970s, did not deal with profoundly deaf drivers, indicated a higher rate of accidents for hearing impaired but the reports of those reports discredited the methodology. Meaning there are NO reports at all!
Which leaves us with: science and physics. 30 seconds to respond to a critical audio cue or 1/1000 seconds to see an askance visual clue. What does SCIENCE tell you? I will help you with some basics: F=ma. m=delta t over delta s. m=2 tons. Solve for s for delta t being 1:30 and delta t being 1:.0001. You don’t have to show your work.