Final answer:
The two types of speed signs are speed limit signs and advisory speed signs. Speed limit signs denote the maximum legal speed, while advisory speed signs suggest safe driving speeds for particular road conditions. The correct answer is D) Speed limits and advisory speed signs.
Step-by-step explanation:
The two types of speed signs mentioned are (D) Speed limit signs and advisory speed signs. Speed limit signs indicate the maximum legal speed that vehicles can travel on a particular stretch of road under ideal conditions.
On the other hand, advisory speed signs provide recommended speed limits for specific conditions or road segments, such as sharp curves, where driving at the maximum posted speed limit might not be safe. Understanding and adhering to these signs is crucial for road safety and compliance with traffic laws. The correct answer is D) Speed limits and advisory speed signs.