Even if I could keep it to well under the speed limit without getting rear ended by someone else coming down the hill, which is a real concern here, and keep it to say 15mph under constant light braking, when I hit the last part and decelerate from 15mph to 0, even over a loonnnngg protracted duration(again, wildly impractical due to rear ending concerns), I'm up against gravity.
The 0.3g that Tesla allows for before hitting a "hard braking" event at a 20 downslope leaves me very little margin indeed. If my math is right, I think I'm already at 0.22g just from the grade. This handy
deceleration calculator then tells me that if I want to stay under budget then I have to slow from 25mph to 0 in no shorter than 16 seconds to stay under the remaining 0.08g. That's really drawn out.
I guess I could engage autopilot and let it brake for the intersection for me so it doesn't count against my score. By I find that autopilot brakes *hard* in this circumstance, as it doesn't extend the braking duration at all to account for the slope. It treats it as it would any other flat intersection.
Or, Tesla could just take into account the angle of the car.