That i can appreciate - my partner doesn't drive so i have a tendency to forget most people share the burden on long drives!
there was no hypo but last year i drove him 9 hours up to Loch Ness for his 30th birthday..... in one day! I was barely running on caffeine fumes by the time we got there!
But anyhoooo that was very off topic... Still thinking about it and thinking temporary engine immobilisation wouldn't be viable at all. But i like the idea of a dash mounted beeper! Even better if we can still get something playing over the car speakers. If it could lower insurance premiums then that's a bonus for drivers