When looking down a straight, open road or along a railroad track.

When field of vision is narrowly confined as in twisted streets, draws, or forest trails.

Light and atmosphere.

When looking over uniform surfaces like water, snow, desert, or grain fields or when the sun is shining from behind the observer.

When the target is in sharp contrast with the background or is silhouetted by reason of size, shape, or color.

In poor light such as dawn and dusk in rain, snow, or fog, or when the sun is in the observer's eyes.

When the target blends into the background or terrain.

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