Here's an update from CAW.I've had to put my project on hold while I installed new Sims 3 SP's and an expansion which needed to be tested.
I started by extending the highway on the other side of the bridge.
https://farm9.staticflickr.com/8679/16544851249_05945eb5d6_c.jpg
I was just placing new sections of road and intersections and had to snap them together.
https://farm9.staticflickr.com/8594/16111012233_1d64e456e6_c.jpg
I had a new bit of highway in the other direction.
https://farm9.staticflickr.com/8637/16729751031_ceefe04776_c.jpg