A sign that displays "Reduced speed, 35 mph" means:

The sign that states "Reduced speed, 35 mph" indicates that the new speed limit of 35 mph begins at that sign. This means that drivers are required to lower their speed to 35 mph immediately upon passing this sign, as they are now entering a zone where this reduced speed is mandated for safety reasons.

In many areas, speed limits may decrease due to factors like approaching schools, construction zones, or residential neighborhoods, all of which necessitate lower speeds to ensure the safety of pedestrians and other road users. Therefore, recognizing that the speed limit change takes effect at the sign is critical for compliance and safety.

Other options may imply different interpretations, such as waiting for additional signage or responding to weather conditions, but the main point remains that the directive is clear: slow down to 35 mph as indicated right at the sign.