is a major arterial road[?]
within a city, or linking several cities together. America has a vast network of national highways linking the different states
together, as does Australia
Probably the most famous highway in America is Route 66, while if you follow Australia's Highway 1, you can travel from capital city to capital city almost the entire way around the whole country.
Highways usually have a higher speed limit than other roads because they have more lanes and are designed for travelling at a higher speed. Highways are a grade below freeways in importance.
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