Chapter 5: Signs, Signals, and Road Markings

Interpreting the language of the road—signs, signals, and pavement markings—is a non-negotiable skill for safe driving. These devices provide rules, warnings, and guidance that are critical for maintaining order and preventing chaos on the roadways. A driver’s ability to instantly recognize and obey them is essential for passing the driver’s license exam and for navigating the complex traffic environment safely every day.

The traffic control system in Tennessee uses a uniform set of shapes, colors, and symbols to communicate with drivers. These devices are categorized into regulatory signs that state the law, warning signs that indicate potential hazards, and guide signs that provide directional information. Traffic signals and pavement markings work in conjunction with signs to manage the flow of vehicles and pedestrians.

Sign Colors and Shapes

The color and shape of a traffic sign provide the first and most important clues to its meaning, often allowing a driver to understand the message from a distance before the words or symbols are legible.

Sign Shapes

• Octagon (8 sides): Exclusively used for Stop signs. This unique shape ensures it is recognizable even if covered by snow or dirt.
• Triangle (point down): Exclusively used for Yield signs. It requires drivers to slow down and give the right-of-way to other traffic.
• Circle: Exclusively used for Railroad Advance Warning signs. It alerts drivers that they are approaching a railroad crossing.
• Diamond: Used for warning signs. These signs indicate potential hazards or changes in road conditions ahead, such as a curve, slippery road, or merging traffic.
• Rectangle (vertical): Typically used for regulatory signs, such as Speed Limit signs.
• Rectangle (horizontal): Generally used for guide signs, providing directions, route markers, or information about services.
• Pentagon (5 sides): Used for School Zone and School Crossing signs.
• Pennant (sideways triangle): Used on the left side of the road to indicate the beginning of a No Passing Zone.