1. Having a lane for traffic in each direction and a centre lane for passing

See also: multilane

• spectator sport
• specter
• spectinomycin
• spectral
• spectral color
• spectral colour
• spectrally
• spectre
• spectrogram
• spectrograph
• spectrographic
• gradable opposition
• gradate
• gradation
• gradational
• gradatory
• grade
• grade crossing
• grade insignia
• grade point
• grade point average
• grade school
• grade separation
• grade-appropriate
• grade-constructed