Final answer:
The speed in a roundabout is generally lower than on straightaways, tailored to ensure safe navigation. Drivers must adhere to posted signs specifying the legal speed limit, which may differ from the speed that prompts enforcement action.
Step-by-step explanation:
Unless otherwise posted, the speed in a roundabout is generally lower than standard highway or road speeds. This is due to the need to navigate the circle safely and yield to traffic. The specific speed can vary based on the location and design of the roundabout. It is crucial for drivers to follow the posted speed limits, keeping in mind that the de facto speed limit is often gauged by law enforcement discretion, which might differ slightly from the de jure speed limit. When approaching or driving in a roundabout, it is important to observe any posted signs indicating the legal speed limit and adjust your speed accordingly to maintain safety. The ideal speed is the maximum safe speed at which a vehicle can turn on a curve without relying solely on tire friction.