I spent today tinkering with one of my newer cities.
I level some ground off the shore and put an airport on it (lower left)
Then built a highway to connect the only bits of solid land on the map that i can use. I want to connect two points without traffic spilling all over the place so i made a giant overwater roundabout. I tested it. it works.
Bonus: i posted this already in the comments, but it is funny for us Jalops and Oppos: even in a city simulation, BMW owners park like jackasses. (don’t flame me, i used to be one)