Final answer:
A vehicle may use the left lane on a limited access highway with a posted speed limit of 65 mph for specific reasons such as to pass slower traffic, avoid obstructions, turn left, or exit the highway. Following these rules is essential for traffic safety.
Step-by-step explanation:
The question pertains to the rules for driving in the left lane on a limited access highway with a posted speed limit of 65 miles per hour. Generally, there are specific reasons when a vehicle may legally use the left lane. These include: 1) To pass another vehicle that's traveling slower, 2) To avoid an obstruction, 3) To turn left, and 4) To exit the highway. It is important for drivers to follow these guidelines to ensure traffic safety and maintain the flow of traffic. Exceptions to these rules can vary by state, so drivers should familiarize themselves with local traffic laws.