The driver of vehicle 1 wants to turn left. What must she do first?

To turn left safely, the driver of vehicle 1 should first pull to the middle of the intersection. This action allows the driver to position the vehicle appropriately while waiting for oncoming traffic to clear before completing the turn. By pulling into the intersection, the driver can also clearly see oncoming vehicles and determine if it is safe to proceed.

It's essential for drivers making left turns to be visible to other road users and ensure they take necessary precautions to avoid collisions. Stopping before the intersection may prevent the driver from having a clear line of sight to determine when it is safe to turn. Waiting for the oncoming vehicle to pass can be important, but pulling into the intersection helps establish an intent to turn while facilitating a better view of the traffic situation. Reversing is not a practical or safe maneuver in this context, as it could confuse other drivers and create a hazardous situation.