At what speed are you allowed to drive a passenger car on the road beyond this sign?

Why?

The D-43 end-of-built-up-area sign marks the exit from that area, and the road shown has a single carriageway carrying traffic in both directions. The limit for a passenger car without a trailer is 90 km/h unless signs require a lower speed. The 100 km/h limit applies, for example, to a single-carriageway expressway, while 70 km/h is the limit for a car towing a trailer on an ordinary road like this.

art. 20 ust. 3 pkt 1 lit. d Prawa o ruchu drogowym