The Ada County Highway District (ACHD) is installing the first of several new-design signals with flashing yellow, left-turn arrows at State Street/Bloom Drive/Plantation River Drive Tuesday morning. They replace the traditional green ball with a flashing arrow to tell drivers they can turn left if it is safe to do so with no oncoming traffic. Both the yellow arrow and green ball indicators reduce traffic delays, but research has shown the arrows reduce accidents.
“The flashing yellow arrow is more clearly understood, which helps make it a safer signal,” said ACHD Traffic Engineering Supervisor Ross Oyen. “The solid green sends a message of ‘I can go’ versus a yellow arrow that sends the message that ‘I better be cautious.’”
Arrow-signals will also be installed at State Street’s intersections with Willow Lane, Ellens Ferry Drive, Collister Drive and possibly Pierce Park Lane in coming weeks.
If the new signals perform as expected, increasing safety while reducing delay, ACHD will install the flashing arrows throughout the county. In late 2009, the federal government approved the signals for wide use after several years of testing.
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