Track designer, Apex, describes freeway closeness...
The Turnpike freeway is less than 25 metres away from the track at this point, and this area will be inaccessible to the public with only marshals stationed there.
“Having the Turnpike so close, to protect the race cars and the marshals we will erect barriers and screens along the boundary so that drivers on the Turnpike aren’t distracted by what’s going on. So that was a major concern to us, to ensure it’s a safe race for everyone.
“As there’s no room to have any grandstands or spectators here, F1 has been very keen to fill this area with cameras to ensure multiple TV viewing angles – as we know we’ll see a lot of interesting on-track action here.”
“[Apex founder and director] Clive Bowen’s concept design required us to route the track through this zone and for us to get beneath the first overpass, we had to meet the FIA regulation that requires at least four metres of clearance, but as we have to tie into the levels of the Turnpike slip road that has a 7% crossfall, our track surface was climbing just at the point where we needed it to be falling.
“There is also an F1 regulation about the rate of change of elevation linked to the square of the speed of the car, so this design basically threads the needle in three dimensions to ensure that the cars go slowly enough to align with the camber of the crossing and then get back under the overpass."
https://us.motorsport.com/f1/news/mi...sign/10247903/