Final answer:
Lanes marked on both sides by double-broken yellow lines are known as center turn lanes.
Step-by-step explanation:
The lanes marked on both sides by double-broken yellow lines are known as center turn lanes. These lanes provide a designated space for drivers to turn left, separate from the through traffic. They are typically found on busy roads or streets where making a left turn directly from the regular traffic lane would be unsafe or cause congestion.
For example, imagine a four-lane road with two lanes in each direction. In the middle of the road, there is a center turn lane marked by double-broken yellow lines. This center turn lane allows drivers in either direction to safely wait and make a left turn, without impeding the flow of traffic on the regular lanes.
This type of lane marking is important for traffic safety and helps to improve traffic flow by providing a designated space for turning vehicles.