Pavement-marking questions can be solved with a fixed reading order: color, number of lines, broken or solid pattern, and the driver's adjacent side. Do not jump from one visible feature to a passing conclusion before checking the rest.
Use the four-step line reading
Start with color. Yellow center-line markings separate opposing traffic streams. White lane-line markings separate lanes travelling in the same direction. This first split prevents a same-direction lane-change rule from being applied to the center of a two-way road, or an opposing-traffic rule from being applied between neighboring lanes flowing together.
| Pattern | Federal marking meaning in this practice scope |
|---|---|
| One broken yellow center line | On a two-lane, two-way road, either travel direction may cross to pass with care |
| Yellow pair, one broken and one solid | The side next to the broken member may cross carefully for passing; the side next to the solid member may not |
| Two solid yellow center lines | Crossing for passing is barred from both travel directions |
| Broken white lane line | Crossing with care is neither discouraged nor prohibited by that line |
| One solid white lane line | Crossing is discouraged |
| Paired solid white lane lines | Crossing is prohibited |
Next count the lines and inspect the pattern. A single broken yellow center line on the stated two-lane, two-way road marks a two-direction passing zone, subject to care. Two solid yellow center lines create a no-passing treatment in both directions. The mixed yellow pair is asymmetric. Imagine standing in each travel stream: a driver next to the broken member has the permissive passing side, while a driver next to the solid member has the restrictive side. The mere presence of one broken segment does not make both sides permissive.
For white lane lines, pattern creates a three-level ladder. A broken line leaves careful crossing available. A single solid line discourages crossing. Two parallel continuous white strokes prohibit crossing. Keep this ladder separate from yellow center-line meanings. The device standard meaning explains what the marking communicates; a broader driving situation can still involve controls and duties outside this selected federal layer.
The traps
- Assigning yellow center lines to neighboring lanes flowing together. Yellow center-line markings divide opposing travel streams; white lane lines divide same-direction lanes.
- Treating one broken yellow center line as a two-way ban. On the stated two-lane, two-way road, drivers in either direction may cross it to pass with care.
- Treating two solid yellow center lines like a passing zone. That pair prohibits crossing for passing from either direction.
- Using yellow between lanes that flow the same way. Same-direction lane lines are white; yellow is the center-line color for opposing directions.
Try it
A double yellow center line has one broken line and one solid line. Which MUTCD statements are correct? Select all that apply.
- Traffic on both sides may cross for passing because one line is broken
- Traffic adjacent to the broken line may cross for passing with care
- Traffic on neither side may cross under the marking described
- Traffic adjacent to the solid line may not cross for passing
Which white lane-line pattern does the MUTCD specify where crossing the line is prohibited?
- A normal-width broken white line
- A single dotted yellow line
- A broken yellow center line
- A double solid white line