Driver's License Test Prep
Pennsylvania Practice Warning Signs

A TWO-WAY TRAFFIC AHEAD warning sign tells you what?

Yellow diamond with two straight black arrows side by side, left arrow pointing down and right arrow pointing up
  1. A.
    Traffic in your two lanes will merge into one
  2. B.
    You are entering a one-way roadway
  3. C.
    Two lanes of traffic move in opposite directions Correct
  4. D.
    A two-way left-turn lane begins in the center
The Why

The answer is "Two lanes of traffic move in opposite directions"

The sign marks where a one-way stretch ends, so ahead you will drive on two lanes moving in opposite directions and must stay right of the centerline. Choice D trips drivers who hear 'two-way' and picture the yellow-arrow center left-turn lane painted on some city streets, a pavement-marking rule that has nothing to do with this diamond warning sign.

Why the others miss

The traps in the wrong answers

A. Traffic in your two lanes will merge into one

The sign warns about oncoming traffic on a two-lane road, not about lanes joining into one. This answer reads 'two-way traffic ahead' as a merge warning by borrowing the LANE ENDS MERGE sign printed just beside it on the same manual page.

B. You are entering a one-way roadway

The sign marks where a one-way stretch ends, so the road ahead is two-way, not one-way. This answer reverses the direction of the transition by treating the sign as describing the road being left rather than the road being entered.

D. A two-way left-turn lane begins in the center

The sign announces oncoming traffic on an ordinary two-lane road, not a shared center turn lane. This answer reads 'two-way' as the label for the yellow-arrow center left-turn lane painted on some city streets, mixing a pavement-marking rule with a warning-sign meaning.

The Rule

This question tests your knowledge of Warning Signs in Pennsylvania. Source: Pennsylvania Driver Manual, "Warning Signs: TWO-WAY TRAFFIC AHEAD," p.15..

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