After years of construction and anticipation, Metro’s long-awaited D Line extension officially opened to passengers Friday morning, giving riders a faster connection between downtown Los Angeles and Beverly Hills. The newly opened stretch adds three underground stations along Wilshire Boulevard: Wilshire/La Brea, Wilshire/Fairfax and Wilshire/La Cienega. Metro officials say the expanded route can take riders from downtown Los Angeles to Beverly Hills in about 20 minutes, dramatically cutting down commute times through one of the region’s busiest traffic corridors.