The yellow diamond warning sign with a black cross symbol means:

Correct answer: C – Another road crosses ahead
This is a crossroad intersection warning sign. It alerts drivers that another roadway crosses the route ahead and that turning or entering traffic may be present. It is different from the round railroad advance-warning sign and from service signs identifying medical facilities.
Source: Utah Code § 41-6a-301 — Standards and specifications for uniform system of traffic-control devices and school crossing guards., Manual on Uniform Traffic Control Devices for Streets and Highways, 11th ed. — § 2C.41, “Intersection Warning Signs”



