What do the signs on the M25 mean?

When I have been driving on the M25 I have seen signs saying things like M25A 36.9 - there is a sign but the writing is too small for me to read and I am usually on my own in the car and it is now starting to bug me as to what they mean please help

Answers:
They are DISTANCE signs.

36.9 is the notionl starting point off the road. They're used t help people better figure out where they are especially when reporting an accident.
Don't have any idea where in the USA you are asking about. Maybe they added metric? Or an alternate route?
They all mean.. BEVERLY D GET OFF THE MOTORWAY YOU ARE A DANGER TO OTHER DRIVERS AND GET AN EYE TEST.

lol
as above
The M25 is a major motorway around London in the UK,I believe the signs you are talking about, are either are mileage or kilometre markers to a particular junction.
if you can't see the signs properly you need to get an eye test straight away, if you get pulled by the cops you will be in big trouble
signs to show the miles to the exit.
Have to go on M25 in 2 weeks. I will have hubby in car so will get him to have a look!
Sorry can't be more help!
These are probably just reference signs used by the emergency services and motorway maintenance crews.
tells you how many km to reach your destination?

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