How to use the online alarm clock
Pause your M25 route and kit check long enough to set the alarm for 2:41 am, so you have a clear signal to break away from what you are doing and get ready to leave for the night roadworks. The alert falls 19 minutes before 3:00 am, giving you a defined handover point rather than letting the preparation drift towards the hour.
A departure this late can easily outlast a phone’s usual screen timeout, so keep the browser alarm page active and prevent the phone from going to sleep before 2:41 am. Check that the volume is audible, then leave the phone connected to power nearby. If the page stops running or the phone sleeps, the alarm will not sound, which could leave your M25 roadworks crew waiting for you.
Leaving for the M25 while the house is quiet calls for an alert that reaches you without waking everyone else. Put the phone close enough to hear at a moderate volume, preferably on a firm bedside surface rather than against a shared wall. Have your clothes, keys and roadworks gear together beforehand, so when 2:41 am arrives you can silence the alarm promptly and move through the house with minimal light and noise.
Common questions
Will it still be right when the clocks change?
Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
Does the alarm still work if I close the tab?
No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.
What happens if my laptop goes to sleep before 2:41 am?
The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.
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