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The Los Angeles County Metropolitan Transportation Authority (LA MTA) recently finished installing 59 active warning signs in Long Beach, Calif.

The authority spent $500,000 to install the light-emitting diode signs at all left-turn lanes on Long Beach Boulevard and Pacific Avenue to warn motorists that a train is approaching the intersection. LA MTA officials hope the signs prevent accidents in left-hand turn lanes in the street-running portion of the Metro Blue Line, a 22-mile light-rail line that operates between downtown Los Angeles and Long Beach.

Six years ago, LA MTA installed similar signs in downtown L.A. Accidents in left-turn lanes since have decreased 71 percent.