In this situation, does the expressway end immediately after the visible sign?

In the video, you are driving on an expressway; on both sides of the roadway there are signs D-8 "end of expressway" with plates "1000 m". The expressway does not end immediately after the visible sign - it ends only a kilometre further on. The answer is: no.

The Regulation on road signs and signals states that the end of an expressway is marked with sign D-8, and plate T-1a placed under sign D-7, D-8, D-9, D-10, D-13, D-13a or D-14 shows the distance to the beginning or end of the road or lane. So sign D-8 with the plate "1000 m" is an advance warning: the expressway continues for another kilometre, and the actual end will be marked by a second D-8 sign, this time without a plate. Over this kilometre all the rules of the expressway still apply - the 120 km/h limit on a dual carriageway, the ban on stopping outside designated places, the ban on U-turns and reversing. The purpose of the advance warning is the same as with warning signs: a driver travelling at 120 km/h needs time and space to slow down smoothly to the speed of an ordinary road, instead of braking sharply at the very end. So you take your foot off the accelerator gradually, watching whether the cars in front of you are slowing down faster.

Legal basis: § 48 para. 1 and § 50 of the Regulation on road signs and signals