How to use the online alarm clock
While you wait for the signal to leave for overnight roadworks on the M25, a 12:40 am alarm keeps the departure point visible without repeatedly checking the clock. It leaves twenty minutes before 1:00 am, enough time to gather your pass, outer layer and any kit needed at the work area.
With the roadworks alarm running, the browser page may sit behind a rota, map or message screen; the countdown should continue and the alert can still sound from that background position. Keeping the browser active and its sound permitted avoids a muted surprise. If the page is closed or the phone or laptop goes to sleep, the alarm cannot provide the roadworks cue, so a separate alarm is sensible when the reporting time cannot slip.
Heading towards the M25 at 12:40 am can mean moving between a warm vehicle cab and much cooler air beside the carriageway. Set the air conditioning before departure rather than adjusting it while driving, and keep a layer within reach for the change outside. A comfortable cab is useful, but very cold airflow can make the roadside temperature feel sharper when the shift begins.
Common questions
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 12:40 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.
Cookie policy