What kind of information do advisory speed signs convey?

Advisory speed signs are designed to suggest a safe speed for drivers under specific conditions, typically indicating a speed that is appropriate for navigating curves, intersections, or other situations that may require reduced speeds for safety reasons. The correct answer reflects that advisory speed signs specifically indicate the maximum recommended speed for a curve, helping drivers to maintain control of their vehicle and minimize the risk of accidents or skidding due to centrifugal forces.

These signs serve as guidance rather than enforceable limits, which can help drivers make prudent decisions based on current road conditions. Knowing the recommended speed for a curve allows drivers to navigate it safely without exceeding a speed that could lead to a loss of vehicle control. The other options refer to situations that advisory signs do not address, such as enforced speed limits or regulations specific to certain vehicle types.