Safety First

You know it happens to everybody, and I always welcome those moments of epiphany where in spite of thinking I have a reasonable grasp of a subject, I realise that I missed something. I missed something big.
Happened again today.
For some time I have argued the point that the percentage of time that frost fans operate in a year is wrong for this reason or that reason and to be honest it's all about the weather and there's the definition of random.
Well, I believe that I have been blinded by arguing the case placed before me that resource consultants want you to believe that it's XX% of the nights in a year that are affected.
Sure it happens, but that's not the main issue.
The main issue isn't even noise.

The main issue is DEATH.

That's going to happen to someone after a sleepless night of being kept awake by frost fans. It won't matter if its the first night without sleep or the third in a row.
This is how it will go.

Someone will be deprived of sleep overnight due to frost fans operating.
The next day they will get into their car and make a bad decision.
They'll die.

New Zealand has an excellent source of local information on the effects of driving without getting enough sleep at http://www.akilla.co.nz/.

It's pretty simple.
It's the equivalent of drunk driving without the alcohol.
Feel free to google the term "sleep deprivation" and driving. Frankly it's horrifying.
You'll read things like;

The driving data provide confirmation that sleepiness is a significant factor leading to off-road accidents. Accident rates showed a small increase after a moderate reduction in the previous night's sleep (4h vs. 8h), and a marked increase with progressive sleep deprivation.

and

Sleepiness (drowsiness, somnolence, hypersomnia) is a feeling of abnormal drowsiness, often with a tendency to actually fall asleep. It is associated with memory deficit, impaired social and occupational performance, and car crashes

and

In a study published this week in the British journal Occupational and Environmental Medicine, researchers in Australia and New Zealand report that sleep deprivation can have some of the same hazardous effects as being drunk.

Frankly, I feel a little sick.