Final answer:
The correct line markings for a one-way street are a solid or broken white line, which serves to separate lanes of traffic moving in the same direction.
Step-by-step explanation:
The color of line markings found on a one-way street is typically d. a solid or broken white line. The purpose of these markings is to separate lanes of traffic moving in the same direction. On a one-way street, you'll often see a single solid white line or dashed (broken) white lines indicating lane divisions. These are in contrast to two solid yellow lines, which usually indicate opposing traffic flows on two-way roads. It's crucial for safety to understand the significance of these various roadway markings.