> This F1 fansite claims that cars can get to around 110 km/h (~70 mph) climbing this thing, which we very much did not achieve.
The fansite link is stating that cars will brake to approach the sharp left-hander of turn 1 at 110km/h (~70mph) (site claims 85km/h on the apex), they'll do well in excess of that on the run up (300km/h+ on a flying lap or still comfortably beyond 200km/h from a standing start).
With that out of the way it looks a great way of using a racetrack when cars aren't going around it, and I'll have to see if there's anything similar in the UK as a lot of racetracks will often have very pleasant surrounds and similarly undulating elevations for a bit of a challenge. (Brands Hatch strikes me as having a lot of potential for a particularly pleasant ride)