Question

you read about an accident at a railroad crossing and wonder about the cause. perhaps the cars driver overestimated the distance of the train because the parallel tracks stimulated the monocular depth cue of: relative motion. light and shadow. linear perspective. relative height.

Explanation:

Linear perspective is a monocular depth cue where parallel lines (like railroad tracks) seem to converge in the distance. This can make objects (like a train) appear farther away than they are. Relative motion involves objects moving relative to each other. Light and shadow relate to how light creates depth through shading. Relative height is about an object's position in the visual field (higher = farther). Since the question mentions parallel tracks (key for linear perspective), that's the relevant cue.

Answer:

linear perspective.