The current requirement to have all vehicles larger than a car sound a shrill alarm when reversing is unnecessary.
It is the driver's responsibility to make sure it is safe to proceed at all times. The current status quo shifts this and is used to intimidate visually impaired and other people out of the driver's way. If the driver cannot see it is clear he or she should enlist the help of a colleague and/or use side mirrors and proceed with more caution.
If nothing else at least the volume could be reduced. If a vehicle is in danger of hitting someone, they must be reasonably close. It cannot be necessary to have the alarms heard 500m away. And a person who is severely visually and hearing impaired will be in danger from traffic no matter what excessive noise is made.
Why is this idea important?
The kind of noise emitted is very distressing to people with some conditions, such as mental health problems or autism spectrum disorders, and is of a type which is difficult to tell the direction of.
There are many situations where there are a lot of vehicles around, they are all sounding alarms and the noise sounds like it is coming from all around anyway.
It will be argued that the alarms are necessary to protect visually impaired people, but the only thing a visually impaired person can realistically do in that situation is panic.
The alarms are of no assistance to anyone from a safety point of view, it is just the worst kind of cya.