The phrase "a long highway" is correct and usable in written English.
You can use it to describe a highway that has a considerable length, often in the context of travel or geography.
Example: "As we drove along a long highway, the scenery changed from mountains to plains."
Alternatives: "an extensive road" or "a lengthy route."
After the lake was a long highway bordered by forest; and then the tolls, and beyond them our father.
"He gave directions to fill the gaps along the highway, even though it's a long highway," said the adviser, Ali al-Moussawi, referring to the highway between Baghdad and the border with Jordan where a bus carrying the Shiite pilgrims was attacked on Monday.
All I really need to avoid my own repeated, smaller failures is probably a watch, and a sensible haircut, and a little TV-dinner-table for my laptop, and peace, and to not have been the very-youngest to the point where my life is a long highway of trying to make other people feel good, entertained, cared for instead of just asking for the unending attention that I actually need.
The simulation represents a 5-km long highway (6-lane) with a fixed average inter-vehicle distance.
We simulate a 2 KM long highway in which 75 vehicles are kept uniformly distributed.
NY 344 was assigned to a 1.52 mile long highway extending from Copake Falls in the west to the Massachusetts state line in the east.
The flame was carried to the top of Mount Everest on a 108 km long "highway" scaling the Tibetan side of the mountain, built especially for the relay.
Both the North and the South Rim are accessible by paved roads, and the two sides are connected by a 215-mile- (346-km) long highway via a bridge near Lees Ferry.
We liked the Town Car a great deal, especially during long highway drives with real-size adult passengers.
In 1984 the BotZam highway, a 190-mile- (300-km) long highway that connected Kazungula and Nata, Bots., was opened.
Another man, Simon Mbaya, pointed down a long barren highway lined by grim-faced citizens.
