The best way to tell that you're in American Samoa is by looking out for an unusual camera car, sometimes a black pickup truck, sometimes a large black or grey car. License plates can also be a good clue, since most have a blueish background.
Plates
Narrow plates which normally look blue behind the blur, because they have a blueish background image on them.
Road markings
Standard road markings have continuous white outer lines and double yellow inner lines
Poles
Street lights are nondescript cylindrical metal poles, and wooden electricity poles are common
Scenery
American Samoa is very tropical and mountainous. There are usually steep, green mountain faces nearby.
