Scored 803 recently.
Traffic flow was 93 km/h.
Concrete usage was 3940 (small bridges almost everywhere).

I'd say 810-815 is the limit.

Managed to get 779, I'd say 790 is doable.

Great work. Looks to me like its pretty well optimised already, but maybe a few more points is possible.

Sorry, I was looking the bridges wrong way, those are in correct way. But still, I would not be surprised if this can get bit higher efficiency

Traffic flow: 94km/h
concrete: 4100 tons

I don't think the three bridge combination at top right is fully optimized, so this can probably got even more points. somethink like 790 - 800 is probably possible, but not too much more, as the unoptimized bridges are not slowing down the flow much.