Take the toll road & bridge from Denmark to Sweden...
Well, in fact there are two toll bridges... the "Øresundsbron" between Denmark and Sweden, 27 Euro each way:
https://www.google.dk/maps/place/%C3%96resundsbron/@55.9524912,9.7552342,7z/data=!4m5!3m4!1s0x0:0xbc0e93c11c372873!8m2!3d55.5706295!4d12.8486395
And the "Storebæltsbro" which keeps Denmark divided in two, because of the toll
, 18 Euro each way:
https://www.google.dk/maps/place/Storeb%C3%A6lt/@55.8693633,9.1640324,7z/data=!4m5!3m4!1s0x0:0x2a26e3c3f9c23dae!8m2!3d55.3336849!4d10.9738827
This is an even bigger experience in engineering than the Øresundsbridge. When build, it was close to be the longest suspension bridge in the world... but the japanese was faster...
Alternatively, there are in fact ferries too, one between Denmark and Sweden, Helsingør-Helsingborg, 25 Euro each way:
https://www.google.dk/maps/dir/3000+Helsing%C3%B8r/Helsingborg,+Sverige/@56.1534535,9.5720015,7z/data=!4m13!4m12!1m5!1m1!1s0x465231112f400bb3:0xf3e36e3c5817f767!2m2!1d12.592127!2d56.030787!1m5!1m1!1s0x46522d7a50a22925:0x4019078290e7a90!2m2!1d12.6945121!2d56.0464674
And the one between Germany and Denmark, Puttgarden-Rødby, 41 Euro each way:
https://www.google.dk/maps/dir/54.5026415,11.2280645/54.6543719,11.35086/@55.7640547,9.361213,7.25zAnd the other, Rostock-Gedser, 51 Euro:
https://www.google.dk/maps/dir/54.1506865,12.0975828/Gedser+Landevej,+4874+Gedser/@55.9824161,9.37469,7z/data=!4m8!4m7!1m0!1m5!1m1!1s0x47ad225cd11ee319:0x66a012cc31be37b8!2m2!1d11.9243255!2d54.5742605
I think there are some ferries directly between Germany and Sweden as well, the Swedes must know about that.