The highway bowls provide a place for the runoff to settle. But there's another reason these areas are carefully manicured by highway engineers. The bowl areas provide a place for the chemicals to settle out before being absorbed by groundwater. This is more of a problem on the Mainland with salt from winter seedings, but it's a design feature of most modern highways. According to the Department of Transportation's Marilyn Kali, the H-3 and Kamehameha interchange pictured here is pretty typical.
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