How to use the online alarm clock
Preparing now for night roadworks on the M25 means setting a 12:21 am alarm before departure becomes urgent. It leaves a useful margin before 1:00 am for checking the shift details, gathering your kit and confirming the correct access point without rushing at the door.
For an M25 roadworks departure, choose the alarm sound according to where you will be waiting. A softer tone may be enough in a quiet room, while a more insistent one suits a noisy depot or a moment when tiredness could make the first notes easy to overlook. Set the volume deliberately and test it once from the place where the phone will sit. Do not make this browser alarm the sole safeguard for the roadworks shift: it may stay silent if the browser session ends or the phone falls asleep, leaving the departure unnoticed.
Before settling down at this late hour, work backwards from the actual journey rather than assuming the M25 will be clear. Check the planned route and junction shortly before resting, then allow extra time for overnight closures, diversions and reduced lanes. Keeping keys, identification and work gear together makes the 12:21 am signal the start of a measured departure, not a search around the house.
Common questions
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 12:21 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.
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
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