Final answer:
The force of wind on a billboard is not inherently tied to the compass direction but rather to the speed and angle of the wind. Equal speeds from any direction would exert equal force, but local conditions can influence wind patterns.
Step-by-step explanation:
The direction of wind that exerts the most force on a billboard is not dependent on the compass direction (North, South, East, or West) but rather on factors such as the wind speed and the angle at which the wind strikes the billboard. Wind from any direction can exert significant force if its speed is high enough. However, if we consider a scenario where wind speeds are equal from all directions, the force exerted should theoretically be the same regardless of the direction of wind.
Nevertheless, specific local conditions, such as geographic features and buildings, can affect wind patterns and potentially cause higher wind speeds from a particular direction. The orientation and design of the billboard itself can also affect how much force it experiences from winds coming from different directions.