Draw your horizon line based on where your eye falls naturally on the canvas. In the case of train tracks or highway, for example, this line determines that horizontal line where land meets sky.
Determine your "vanishing" point by the pinpoint where your two lines meet on that horizon line. Linear one-point perspective requires a vanishing point that brings parallel lines to meet, as if looking off into the distance. Think of drawing train tracks or a highway, and where the two outer lines would meet on the horizon. This is your vanishing point.
Follow orthogonals, or the visual diagonal rays, when including other items in your artwork. This draws the eye of the viewer toward that vanishing point. For example, to include a fence or houses on the side of the road, or a train along the train tracks, these must follow lines that narrow toward your vanishing point. This makes objects appear larger in the foreground and smaller toward the background.
Add texture gradient technique to enhance the illusion of distance. In the case of drawing a highway, the scenery on either side of the highway will seem to smooth out or change texture the farther away they are in the distance. For instance, wildflowers growing on either side of the highway will lose detail the farther down the road the eye wanders, or cobblestones will smooth out the farther down the path they extend.
Shade objects to create a shadow effect from where light would naturally fall in your drawing, which enhances the depth of your artwork. The farther away from the light source, the more shadows fall and the less detailed the object. In landscape art, scattering your light and shadow creates an aerial perspective of depth, since there would be no vanishing point as in linear perspective.