In general, a driver making a left turn is at fault if they fail to yield the right of way to oncoming traffic or if they make an illegal or improper left turn. According to traffic laws in most states, a driver making a left turn must yield the right of way to oncoming traffic, pedestrians, and other vehicles that have the right of way. This means that the driver must wait for any oncoming traffic to pass before making the turn.
If a driver fails to yield the right of way and collides with another vehicle, pedestrian, or obstacle, they will likely be at fault for the accident. This is because they violated a traffic law and did not follow the proper procedures for making a left turn.
In some cases, a driver making a left turn may also be at fault if they are distracted or not paying attention to their surroundings. For example, if a driver is texting while making a left turn and does not see an oncoming vehicle, they may be at fault for the accident.
It is important to note that fault in a car accident is not always clear-cut and can depend on the specific circumstances of the accident. An investigation may be necessary to determine the cause of the accident and who is at fault.