The modding guys over at Simtropolis have updated the NAM, which is short for Network Addon Mod. This is a highly recommended download if you want to enhance your game experience. What is the NAM?
The Network Addon Mod (NAM) combines all transportation network-related fixes, additions and new creations that have been released so far. It will add countless new features to the existing network tools, such as new overpasses, highway onramps, intersections, ped-malls, a ground light rail network, roundabouts and turning lanes.
Thanks to djvandrake for the heads up.