A yellow diamond sign displaying a black cross warns of:

Correct answer: C. – A four-way intersection ahead
This is the cross-road warning sign. It indicates that another road crosses the roadway ahead, creating a four-way intersection. Watch both sides for approaching traffic and be prepared to respond to any signs or signals at the intersection.
Source: Washington State Driver Guide — §§ 4.12–4.13, “Other Traffic Signs”; “Cross Intersection”




