Texas Car / Permit practice question · Signals & Pavement Markings

On an interstate highway you notice a solid yellow line marking the left edge of the pavement. It tells you that:

Answer choices

• You may not drive to the left of that line— Correct answer
• The shoulder to your left may be used for passing
• Traffic ahead merges in from the left
• The lane to your left is reserved for carpools

Why this is the answer

On the left edge of the road, a solid yellow line is a guide telling drivers that driving to the left of it is prohibited. You may see this type of line on interstate highways. It does not mark a passing lane, a carpool lane or a merge point, so keep your vehicle on the right side of the line.

Source: Texas Driver Handbook — Pavement Markings

Content reviewed against official driver handbooks · August 12, 2026