And as for D/deaf people: As usual, don't generalise (it's as stupid and wrong as generalising about 'cyclists')--D/deaf people are as diverse as anyone else and some will be good riders and some bad. Some will have lived with the disability from birth or for a long time, some may suddenly have become D/deaf, for some it may have been a protracted process, etc. Many D/deaf people have excellent compensation mechanisms for their lack of hearing and be very alert indeed.
And as for D/deaf people: As usual, don't generalise (it's as stupid and wrong as generalising about 'cyclists')--D/deaf people are as diverse as anyone else and some will be good riders and some bad. Some will have lived with the disability from birth or for a long time, some may suddenly have become D/deaf, for some it may have been a protracted process, etc. Many D/deaf people have excellent compensation mechanisms for their lack of hearing and be very alert indeed.