Final answer:
A yellow and black "recommended speed" sign next to a warning sign signifies the ideal speed for specific driving conditions, which is typically lower than the legal speed limit, to maintain road safety.
Step-by-step explanation:
When a warning sign is joined with a yellow and black "recommended speed" sign, it indicates the ideal speed for a specific driving condition such as a curve in the road.
This suggested speed is often lower than the posted speed limit and is considered to be the maximum safe speed at which a vehicle can navigate the turn without the aid of friction between the tire and the road. It serves as guidance to ensure drivers can safely make the turn, especially under less than perfect driving conditions.
Notably, these recommended speeds are not the same as the legal de jure speed limits, which are the enforceable limits set by law. The recommended speeds are based on the idea that the conditions of the road, whether due to curvature, visibility, or other factors, warrant a slower pace for safety reasons.
However, it's important to remember that while you may not get a ticket for driving at or below the legal de jure speed limit, driving at a speed higher than the recommended speed in these particular areas can still be risky.
Therefore, adherence to both the legal and recommended speed limits is crucial for maintaining road safety and avoiding potential accidents.