Along a highway you pass a rectangular blue sign with white symbols showing a fuel pump, a fork and knife, and a bed. What does the blue background tell you this sign is doing?

Why B is correct

Blue is the reserved colour for motorist services guidance: fuel, food, lodging, hospitals, rest areas and similar amenities. These signs are neither warnings nor commands; they exist so a driver who needs something can find it without stopping on the shoulder to read a phone screen. The colour system lets you sort signs into families instantly — red commands, yellow warnings, orange work zones, green directions, blue services, brown recreation — and blue specifically answers the question of what you can obtain at the next exit.

Why the other options are wrong

A. Warning of emergency vehicles operating ahead

Emergency operations ahead are the province of orange work-zone signs or yellow incident warnings, never blue. Blue does not warn; it points to something available.

C. Marking a rest area closure ahead

Rest areas are indeed shown on blue signs when open, but the sign is not announcing a closure. Closure notices ride on orange or yellow warning plates, and the blue panel's whole job is to advertise availability.

D. Regulating which vehicles may stop at the roadside

Blue signs command nothing. They describe what exists, and a driver is free to pass them without consequence — a category that regulatory signs, by definition, are not.

On the road

Two hours into a western slope run, your passenger needs fuel and coffee. The blue cluster sign at the upcoming exit lists a pump, a cup and a bed — everything in one interchange. You take the exit with confidence you would never have from a guessing game with unsigned side roads, which is the entire civilisational point of the blue panel.

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