Definition

1. Adjective: Having two lanes for traffic in each direction. It describes a road or highway designed with two separate lanes traveling in one direction and two separate lanes traveling in the opposite direction, typically separated by a median or barrier.

Usage

The word "four-lane" is used attributively, meaning it almost always comes before a noun to describe it. It is a compound adjective formed by combining a number ("four") with a noun ("lane").

Examples

• The city council approved funds to upgrade the old road into a four-lane highway.
• Traffic flows much more smoothly on the new four-lane bridge.
• For safety, the four-lane thoroughfare has a concrete median dividing the opposing streams of traffic.

Advanced Usage

• Hyphenation: The hyphen in "four-lane" is crucial when it is used as an adjective before a noun (e.g., a four-lane road). When used predictively (after a linking verb like "is"), the hyphen is often omitted in modern usage (e.g., "The new highway is four lane"). However, the hyphenated form is always correct and prevents ambiguity.
• Comparative Systems: The term is part of a standard classification system for road capacity, contrasting with "two-lane" (one lane per direction) or "six-lane" (three lanes per direction) roads.

Variants and Related Words

• Four-lane highway/road/boulevard: Common noun phrases using the adjective.
• Multilane (adj.): A more general term for a road with more than one lane in each direction, which includes four-lane roads.
• Dual carriageway (n., chiefly British English): This is a close conceptual equivalent, describing a road with separate carriageways for traffic in opposite directions. A standard dual carriageway is often a four-lane road.

Synonyms

• Dual-carriageway (when used as an attributive adjective in some contexts, e.g., "a dual-carriageway road")
• Divided highway (This emphasizes the physical separation between directions, which is a typical but not absolute feature of a four-lane road.)

Antonyms

• Two-lane (adj.): Having only one lane for traffic in each direction.
• Single-carriageway (n., chiefly British English): A road where traffic in both directions shares the same paved surface without a central reservation.

Adjective

1. having two lanes for traffic in each direction