Is it permissible to turn left in a roundabout if there are no other vehicles around?

The correct answer to the question regarding turning left in a roundabout is that roundabouts always have traffic flow to the right, and turning left against this flow is generally not permissible. Roundabouts are designed to promote circular traffic movement, and all vehicles are expected to enter and navigate the roundabout in a counter-clockwise direction.

Turning left in a roundabout would contradict the fundamental design and purpose of the roundabout, which is to facilitate smoother traffic flow and reduce the likelihood of collisions. By always moving to the right, vehicles yield to traffic already in the roundabout, which increases safety by allowing for proper yielding and reducing confusion about right-of-way.

In the context of the other options, even if a vehicle were the only one present, the rules governing roundabout navigation do not change. Signaling, while important for communicating intentions to other drivers, does not alter the basic traffic regulations that govern how vehicles should operate within a roundabout. Emergency vehicles also follow the same rules, utilizing the roundabout appropriately rather than turning left against the established traffic pattern. Therefore, turning left in a roundabout is not permitted regardless of the presence of other vehicles.