I’ve climbed the bridge 2wice, but it was many many years ago, well before there was any thought of doing it as a legal and commercial operation.
It was late at night both times and we had to swing ourselves around big steel spikes wrapped in barbed wire some 50mtrs above the roadway.
Then once on top of the arch we had to climb through and over the rigging on the maintenance cranes that were there to get to the main stepped walkway on top of the main arch. Friggin scary it was and I could never do that now with my fear of heights.
It was well worth the effort though, even though it was at night.
The second time up we met some guys on top doing the same as us but they had started from the Southern end.
We did it the hard way I have since learned.
There was a much easier way of getting up through the inside of the inner arch and coming through a hatch at the top and then using the gantry ladders to the very top.
I believe there was even a guest book inside the inner arch which people signed. That would be an interesting read.