That Purple Line On The Edge Of The Motorway

Name: That Purple Line On The Edge Of The Motorway
Genre: Mystery, Horror
Released: 1970-01-01T00:00:00.000Z
Rating: 4

"What is it ? Why is is there ? And why is it Purple?"

What is up with that Purple tube that runs alongside the motorway ? Who put it there? Why is is there? And where on earth does it lead?