TD101 All chapters
Chapter 06

Reading Signs & The Interstate System

Even vs. odd, loops vs. spurs, mile markers and exit numbers decoded.

Summary

What you'll learn

  • Odd interstates run north–south, even run east–west.
  • Three-digit routes are loops or spurs of a parent.
  • Mile markers count up from the south or west.
  • Exit numbers usually match the mile marker.
  • Sign colors each have a meaning — learn them.
Watch

From the road

An interstate at golden hour — the country's longest classroom.

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