A 1970 Rover 3.5 Litre Saloon, DPK797J shows that she has no difficulty keeping up with modern traffic as she completes an anticlockwise lap of Manchester's M60 orbital motorway with ease.
This footage starts at the Shell on the A57 Regent Road - heading first out on the M602 then back into central Manchester along the same road.
This section is from J2, the anticlockwise exit for Cheadle to J25, passing the notional start of the M60 at J1, the Pyramid building, the headquarters of Co-op Bank and under Stockport Viaduct [1:24]
The sound was recorded with the built-in microphone - even by modern standards the P5b is a quiet car.
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https://www.youtube.com/watch?v=v5_-7mQxJ5g