Your points are all valid. I want to add that the equivalent for a tunnel for parts of Florida is an elevated roadway. When State Road 84 was built through the

Your points are all valid. I want to add that the equivalent for a tunnel for parts of Florida is an elevated roadway. When State Road 84 was built through the Everglades, it blocked water flow and generally had poor environmental planning. The upgrade to I-75 included 'bridges and culverts designed to let water and wildlife pass underneath' (quoting Wikipedia).