I've been trying to make a sunken highway in my city, and the mods appear to be working well. The issue I have is when I try and attach on ramps to the sunken highway. I cycle through and select the correct piece, but it refuses to connect. I have had some luck deleting a section of the highway and placing the on ramp in the deleted section, and then simply constructing more highway tiles so they all fit together. This doesn't always work though, and I may end up with only one on ramp and no off ramp at that location. Has anyone encountered this issue and knows how to work around, or patch it?