Chapter 5: Signs, Signals, and Road Markings

Road signs, traffic signals, and pavement markings form the language of the road, providing essential information, warnings, and regulations. Understanding this language is non-negotiable for safe driving and is a major focus of the Pennsylvania knowledge test. Correctly interpreting these guides allows a driver to anticipate conditions, follow the law, and navigate safely through any traffic environment.

Sign Colors and Shapes

The color and shape of a traffic sign provide the first clue to its meaning, allowing a driver to understand the message even from a distance. Each has a specific, standardized purpose.

Sign Shapes

• Octagon (8 sides) — Exclusively for STOP signs. This unique shape means a driver must come to a complete stop.
• Triangle (Downward Pointing) — Exclusively for YIELD signs. This means a driver must slow down, be prepared to stop, and give the right-of-way to other traffic.
• Circle — Exclusively for Railroad Advance Warning signs. It indicates a railroad crossing is ahead.
• Pennant (Sideways Triangle) — Placed on the left side of the road, it warns of a NO PASSING ZONE.
• Pentagon (5 sides) — Indicates a school zone or school crossing ahead.
• Diamond — Used for warning signs. It alerts drivers to potential hazards or changes in road conditions ahead (e.g., curve ahead, slippery when wet).
• Vertical Rectangle — Typically used for regulatory signs (e.g., Speed Limit, No Parking).
• Horizontal Rectangle — Typically used for guide signs, providing directions or information.