Illinois Driver's Handbook, Section 9: Roadway Signs
Sign shapes and colors, regulatory, warning, construction, special and guide signs.
Summary written by MyPermitExam from the official handbook, 2026. Not a copy of the handbook. Checked Oct 2026. Not affiliated with the DMV. Illinois Rules of the Road (DSD A 112)
Key rules
- Octagon stop, triangle yield, round railroad advance, diamond warning, pentagon school, pennant no passing. p. 63
- Colors: red regulatory, yellow warning, orange work zones, green guide, blue services, brown parks, pink incidents. p. 64