What is the first rule for driving in a roundabout?

The first rule for driving in a roundabout is to slow down to the posted advisory speed. This is crucial because roundabouts are designed to facilitate smooth traffic flow while reducing the likelihood of collisions. Entering a roundabout at a lower speed allows drivers to better assess the situation, watch for other vehicles, bicycles, and pedestrians, and make safe decisions regarding entry and navigation through the roundabout.

Slowing down helps enhance reaction time and improves overall safety. Drivers can observe approaching traffic and yield where necessary, respecting the established flow within the roundabout. By adhering to the advisory speed, drivers also ensure that they can navigate the circular road safely and efficiently without risking loss of control or encountering difficulties while merging into traffic.

Other options, such as entering at a high speed or using the horn to alert others, can create hazardous situations. Similarly, while yielding to bicycles and pedestrians is important, it is typically part of the process after slowing down and assessing the roundabout correctly. Hence, adjusting speed appropriately is the first key step for responsible and safe driving in a roundabout.