If they say congestion at junction 1 then you would know it is 3 o clock direction or eastward location.
If they say junction 5 to 8 then you know they're talking about south of London. If they say crash at junction 15, you know they're talking about 9 o clock direction or westward.
The mid 20s junctions are in the north and 23 is 12 o clock.
If I find the time I will improve the design of the clock.
The middle layer of the clock is a compass to show north east and west, just in case the future generations don't use hand clock faces.