What does a yellow reflector (cat's eye) placed on the road mean?

What does a yellow reflector (cat's eye) placed on the road mean?undefined
No passing
Fire hydrant
Yellow marks the left side of the road
It's safe to pass here

Yellow reflective markers (cat's eyes) are equivalent to a yellow solid line, indicating that overtaking is prohibited. For further reference: white reflective markers (cat's eyes) appear in the center of the road, indicating the middle of the roadway. Blue reflective markers (cat's eyes) signify the presence of a nearby fire hydrant.