How to use the online alarm clock
Before handing the M25 night roadworks over to the incoming crew, set the alarm for 3:23 am so the changeover does not depend on someone watching the clock. It gives both shifts a clear moment for passing on lane closures, equipment details and anything unusual on the carriageway, with 37 minutes still available before 4:00 am.
A roadworks handover can be missed when the alarm sound quietly routes to headphones left in a pocket, cab or kit bag. Check the phone’s audio output after setting the time, then play a brief test sound and leave the headphones disconnected unless they will stay with you. Keep this page open and the phone awake, because otherwise the roadworks handover can arrive with no alarm sound.
As the M25 crew change approaches during the night, keep the screen dim enough that it does not glare against a dark cab or site cabin. Use a warmer display setting if the phone provides one, and place it where the alarm can be heard without leaving the bright screen facing you. After confirming 3:23 am, lock your gaze on the work area rather than repeatedly checking the countdown; a single planned check shortly beforehand is easier on the eyes than frequent switches between darkness and a lit display.
Common questions
What happens if my laptop goes to sleep before 3:23 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.
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.
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