Yeah im kinda confused here by the description and how this highway works. Im not a beginner or anything either. Also kinda sucks that you copy pasta the descripts with only a single picture. Would be amazing if you included an example of it in use in a city with the image you already uploaded, maybe a birds eye view would help too. If i cant immediately understand what an intersection is doing i usually skip the intersection altogether.

so in other words this could help you make a sunken highway through your city?