Which of the following points about roundabouts is true?

The statement that roundabouts run counter-clockwise and that vehicles enter on the right is accurate and reflects the fundamental design and functioning of roundabouts. In a typical roundabout, traffic flows in a counter-clockwise direction, which means that vehicles approaching the roundabout must navigate to the left of the central island. This design is crucial for ensuring a smooth flow of traffic and minimizing collision points.

Entering on the right allows incoming vehicles to yield to those already circulating in the roundabout, which is an essential rule that enhances safety and efficiency. This method of operation is standard in most countries that use roundabouts and helps facilitate easier merging into the traffic flow.

Although other options contain some elements of truth, they do not precisely capture the primary operational characteristics of roundabouts as effectively as the correct statement does.