When is it safe to use cruise control?

Using cruise control is considered safe primarily on long, straight highways with little traffic. This setting allows for consistent speed maintenance without the frequent need for acceleration or braking, which is crucial in maintaining vehicle control and ensuring driver attentiveness. On open highways, where traffic is light and the road condition is good, cruise control can also contribute to fuel efficiency.

In contrast, using cruise control in heavy traffic conditions is not advisable due to the need for frequent adjustments in speed in response to other vehicles. Similarly, during bad weather or rain, it’s essential to have full control of the vehicle, which can be compromised by cruise control, as it may not react appropriately to changing road conditions. Driving in urban areas with frequent stops also makes cruise control impractical, as constant braking and acceleration are necessary, which contradicts the function of cruise control. Therefore, option A is the best choice for safe cruise control use.