We never actually got round to that part of the circuit in those days. The first couple of years ('65 & 66), being poor (just) ex-students, we could only afford the 'billet unique', which was a one-entry ticket - ie you couldn't get out once you were in, unless you paid again. For the next couple of years, we got the 'billet permenant' and went out to mulsanne and Arnage. After that, we got the better tickets which allowed access to the pit straight.
It wasn't till the early 80s that we tried Hunaudieres, and as you say, there was just a bit of armco between you and the cars, but by that time, it wasn't an ACO area - part of the cafe/restaurant.
Anyway - memories are a bit vague - it
was 40 years ago

Del
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Actually now I think about it, the parking was only 'official' in as much as there were a couple of stewards supervising the narrow entrance/exit to the car park. My fading memory cannot recall whether or not you actually had to have an official parking ticket to get into the parking area, and no one actually checked your ticket to get to the 'viewing area' that much I can remember.