Regarding point 3. Different countries we have slightly different signs and road markings but signs for merging is a thing. Example from Denmark: https://koerek

Regarding point 3. Different countries we have slightly different signs and road markings but signs for merging is a thing. Example from Denmark: https://koerekort--guiden-dk.translate.goog/sammenfletning/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=no&_x_tr_pto=wapp https://koerekort--guiden-dk.translate.goog/sammenfletning/?...