Final answer:
The basic speed rule allowed under ideal conditions is the recommended speed, which takes into account various factors to determine a safe and appropriate speed to drive.
Step-by-step explanation:
The basic speed rule allowed under ideal conditions is the recommended speed.
This refers to the speed at which it is safe and appropriate to drive considering factors such as road conditions, weather conditions, and traffic flow. It may vary from the posted speed limit if these factors require a slower speed for safety.
For example, if you are driving on a highway with a posted speed limit of 70 mph but there is heavy rain and poor visibility, it would be recommended to drive at a slower speed to ensure safety.