Black numbers on a white shield set against a black square identify a U.S. route, part of the national numbered highway network, such as U.S. 20 here. Interstate shields, by contrast, are red, white and blue.
Brown guide signs point the way to places of recreational, cultural or scenic interest, such as state and national parks, campgrounds and historic sites. Fuel, food, lodging and hospitals are marked with blue service signs, and the names of cities and towns with their distances appear on green guide signs.
Green signs with white lettering are guide signs: they tell you which way to go, name destinations, give distances to places ahead and mark upcoming exits. They do not warn of hazards or state legal requirements; warnings appear on yellow signs, rules such as speed limits on white regulatory signs, and work zone alerts on orange signs.
A white H on a blue square is the standard service sign for a hospital, telling you that emergency medical care is close by. Lodging is shown with a bed symbol, not a letter.
The white panel shaped like Nevada, carrying the state name and a route number, marks a state highway. Each state chooses its own design for these markers, and several use the outline of the state.
An airplane outline on a green guide sign directs travelers to a nearby airport. Warnings about hazards on the road ahead use yellow signs, not green ones.
Rx is the familiar symbol for a medical prescription, so a blue service sign showing it means a pharmacy is available nearby. A hospital is marked with a large letter H instead.
A blue pentagon with yellow lettering is the standard marker for a county road; it names the county, here Marion County, and gives the road's number. These roads are run by county authorities and mostly carry local traffic.
The white H on a blue square is the service sign for a hospital, and the arrow plaque below it shows which direction to take to get there. Lodging is identified by a bed symbol, not by the letter H.
A bus seen from the front is the general information symbol for a bus station, where travelers can catch local or intercity buses. Like other guide signs of this kind, it shows a white symbol on a green background.
Blue signs with white lettering or symbols direct drivers to services like gas stations, food, lodging and hospitals. Green is used for direction and distance information, and orange for work zones.
A red, white and blue shield bearing the word INTERSTATE marks a route of the Interstate Highway System, in this case I-81. The state name printed on it does not make it a state route; it is still an interstate.
The figure of a person reading an open book is the standard guide-sign symbol for a library. Using a picture instead of words lets drivers recognize the facility at a glance.
Every question in this set has its own page with the correct answer and an explanation.
