Final answer:
When driving, adhere to conditions and practical factors for speed, not just the posted limit, considering safety and an ideal speed for conditions.
Step-by-step explanation:
Never drive faster than the conditions or other factors allow regardless of the posted speed limit. It's crucial to consider both the de jure (legal) and the de facto (practical) speed limits when driving.
Although the speed limit signs indicate the maximum legal speed, various conditions such as weather, visibility, traffic, road conditions, and the capabilities of your vehicle can also dictate a safe operating speed. For instance, driving at the posted speed limit during heavy rain or fog might be unsafe, and slowing down would be necessary. Additionally, you must consider the ideal speed for certain maneuvers, like turning on a curve without relying on tire friction. So, always drive assessing the overall situation, and never exceed speeds that compromise safety, even if it's below the posted limit.