Come around to Vorarlberg, Austria - where we talk about building a Highway in the 70ies or 80ies and never even start building it (all with official planning and studies and resident participation and environmental evaluations and public voting and discussions on the suggested variants). It has become a well known joke in the area.
AFAIK we still don't know where it will be built, but there has been some progress... EDIT: They agreed upon where! But they don't know when and holding another forum due to public outcry over the chosen path... sigh.
Meanwhile, Switzerland built the connection ~40 years ago [1]