A video from EA demonstrates a new feature coming in SimCity update 7: a height tool that allows players to easily create bridges and tunnels.
When creating a new road, the height tool can raise the road off the ground; if raised high enough it will create a bridge, allowing other roads to be constructed beneath it. Similarly, the height tool can sink a road into the ground and create a tunnel.
These tools are meant to give the city's virtual mayor "more power in managing traffic and flow."
SimCity update 7 will hit later this month.