A "rough & ready" solution that might suit your needs is this -


This poi kml & icons here - [Only registered and activated users can see links. ]

(a GB kml of motorway junctions, motorway services & congestion zones)

then follow these instructions here for your sys.txt and mapstates.ini [Only registered and activated users can see links. ]

will give you this

Spoiler: screen shot
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( M4, junction 4 west )

Note : this only works for primo

If you only wish to only know the next up coming motorway junction, here are a few solutions.

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[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]