Where in England does the M4 start?
Where does the M4 end in Wales?
How long is the M4 from its starting point in England to its end in Wales?
How many service stations are on the M4 across England and Wales?
How many M4 service stations are in Wales?
How many Welsh counties does the M4 run through?
When did the Brynglas tunnels open in Wales?
How long are the Brynglas tunnels?
What is unique about the Brynglas tunnels?
Tolls were charged to cross the M4 Severn Bridge until what year?
How many junctions for Cardiff are there on the M4?
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