Double Solid White Line sign
Separates lanes going the same direction where crossing is prohibited.
What to do
Do not cross it to change lanes.
Treat it like a barrier: stay in your lane until the double line ends and you are allowed to change lanes.
Where it's used
Section 3B.06 requires a double solid white lane line where crossing between lanes in the same direction is prohibited. It is often used with a STAY IN LANE sign (Section 2B.40) and, in wide or double form, to separate preferential lanes or form channelizing islands at ramps. Figure 3B-8 shows a typical use.
Don't confuse it with
- Solid White Lane Line: A single solid white line discourages lane changes, while a double solid white line prohibits them.
- Double Solid Yellow Center Line: Double yellow separates opposite directions, while double white separates lanes going the same way.
- Stay in Lane: The STAY IN LANE sign is the sign version of the same rule and is usually paired with these lines.
- Type
- pavement-marking
- Shape
- Line marking
- Colors
- white
- MUTCD code
- MUTCD section
- 3B.06
On state permit tests
Our questions for 51 states ask about this sign, including Alabama, Alaska, Arizona, Arkansas and California.
Test yourself
What is the minimum driving age for an Alabama driver license (not a learner license)? (Alabama practice test)
- 15
- 16
- 17
- 18
Show answer
16. The minimum driving age in Alabama is 16, with a learner license available at 15.
A non-resident 16 or older with a valid out-of-state license must get an Alaska license by the end of how many days after entering the state? (Alaska practice test)
- 60 days
- 90 days
- One year
- 30 days
Show answer
90 days. Non-residents 16+ with a valid license may drive, but must obtain an Alaska license by the end of a 90-day period after entry.
More signs
From the Manual on Uniform Traffic Control Devices (MUTCD), 11th edition, section 3B.06. Sign image: public domain.