Final answer:
A km/h sign underneath a speed limit indicates the maximum speed allowed. The speed given on the sign is the legal limit; for example, '80 km/h' is 22.2 m/s. This enforces regulatory compliance for vehicle speeds on that road.
Step-by-step explanation:
When a sign displays a speed limit with a km/h tab mounted underneath, it indicates the maximum allowed travel speed for that section of road. The specific number that appears on the sign, such as '60 km/h', '80 km/h', or '100 km/h', denotes the exact speed limit. To convert these speeds into meters per second (m/s), you can use the conversion factor where 1 m/s is approximately equal to 3.6 km/h. For example, a speed limit of 100 km/h is equivalent to about 27.8 m/s.
If we consider an example where a sign states 'Speed Limit 80 km/h', it would mean that vehicles must not exceed this speed. In meters per second, this would be calculated as 80 km/h ÷ 3.6 = 22.2 m/s. Therefore, the intended meaning of the sign is to enforce 22.2 m/s as the maximum speed allowed on that portion of the road.