Warning signs · W4-3
Added Lane sign
Archive file: W04-03 Added Lane/W04-03R Added Lane 30x30.svg
FHWA public-use information
What it means
The joining road brings its own lane; an immediate merge is unnecessary.
Source: FHWA MUTCD — MUTCD 11th Edition with Revision 1 (December 2025), Section 2C.46, paragraph 01, PDF page 224.
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Meaning
Added Lane warns that a joining road supplies a new lane. Drivers entering at that point do not have to merge immediately into an existing lane. Pennsylvania distinguishes this arrangement from its Merge warning.
What to do
Recognize the new lane instead of assuming that the joining traffic must squeeze into yours at the junction. Use the warning to understand how the two roads meet; it does not announce a reduction in the existing lane count.
Where it is used
The sign appears before the roads converge without a required merge. Federal guidance seeks a position visible from both approaches; where that is impractical, each approach should have its own warning.
A sign to tell apart
Merge warns of traffic joining the existing roadway stream. Added Lane means the entering road continues in a new lane at the junction. Do not read the two diagrams as the same lane arrangement.
Practice with explanations
These are original learning questions based on the cited handbooks. Read each answer and its explanation below.
1. What does Pennsylvania’s Added Lane warning mean for traffic entering at that junction?
- It must immediately move into the major road’s existing lane.
- It must turn around before the junction.
- It continues in a newly provided lane without a required merge there.
Answer: C. It continues in a newly provided lane without a required merge there.
The new lane accommodates the joining traffic.
2. Which warning would describe joining traffic that must enter an existing stream, rather than Pennsylvania’s Added Lane arrangement?
- Merge.
- Dead End.
- Hill.
Answer: A. Merge.
PennDOT distinguishes the Merge warning from a junction where a new lane makes merging unnecessary.
State source coverage
Handbook coverage and sample questions do not prove that a sign will appear on your exam. Even a published test scope cannot guarantee an individual exam question.
Pennsylvania
Handbook coverage
PennDOT explains Added Lane beside its Merge warning. This documents handbook coverage, without promising selection on an individual exam.
- PA-en · Chapter 2 — Warning signs — Added lane · PDF page 18 · Checked
- PA-en · Chapter 2 — Warning signs — Merging traffic · PDF page 18 · Checked
Pennsylvania permit sources · Practice with Pennsylvania questions
State variations
State-specific variations have not been independently established for this study.
Verified question coverage
These free state-bank questions were independently verified. This does not establish complete state-bank readiness, app availability or what will appear on your permit exam.
No currently verified state-bank question is available for this sign.
The linked 20-question permit quizzes do not currently include this sign.
This meaning is a federal MUTCD reference. Check your state's handbook for its rules and sign coverage; this page does not establish what appears on a state permit exam.
Try the free road sign quiz or find your state's handbook.
