On interstate highways, where must slower vehicles ideally travel?

Answer: C — In the right-hand lane

Slower vehicles should ideally travel in the right-hand lane on interstate highways to ensure smoother traffic flow and enhance safety for all drivers. The right lane is generally reserved for slower-moving traffic, which allows faster vehicles to overtake on the left. This lane arrangement helps minimize congestion and reduces the likelihood of accidents caused by faster vehicles weaving in and out of traffic. In contrast, the left-hand lane is typically designated for passing or quicker vehicles, as it allows for efficient movement of traffic at higher speeds. The middle lane can be utilized for general travel but is not specifically designated for slower vehicles, making the right-hand lane the optimal choice for them. This organization of lanes creates a more predictable driving environment and encourages all motorists to adhere to safe driving practices.