Chapter 5: Signs, Signals, and Road Markings

Traffic control devices are the language of the road, providing essential information about rules, hazards, and directions. Understanding this language is non-negotiable for safe driving, as it ensures all road users can anticipate each other’s actions and navigate the road system predictably. Mastery of signs, signals, and markings is a major focus of the written knowledge exam and a foundational element of collision-free driving.

Sign Colors and Shapes

The color and shape of a traffic sign provide instant clues about its meaning, allowing drivers to understand the message even from a distance. Each shape and color has a specific, standardized purpose.

Sign Shapes

• Octagon (8 sides) — Exclusively used for Stop signs. Its unique shape makes it recognizable even if covered by snow or dirt.
• Triangle (downward-pointing) — Exclusively used for Yield signs. It requires drivers to slow down and give the right-of-way to other traffic.
• Circle — Used for Railroad Crossing advance warning signs. This round, yellow sign with “RR” indicates a crossing is ahead.
• Diamond — Used for Warning signs. These signs alert drivers to potential hazards or changes in road conditions, such as curves, slippery surfaces, or merging traffic.
• Rectangle (vertical) — Typically used for Regulatory signs, such as Speed Limit signs.
• Rectangle (horizontal) — Generally used for Guide signs, providing directions, distances, and information about services.
• Pentagon (5 sides) — Used for School Zone and School Crossing signs. Its shape resembles a schoolhouse.
• Pennant (sideways triangle) — Used to mark the beginning of a No Passing Zone.