MARTINEZ Calif. (KGO) -- You may have heard gunfire around Highway 4 Wednesday night in Contra Costa County, but don't worry it was just a test.
The CHP is preparing to install a ShotSpotter system in areas where they have had a lot of highway shootings.
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The system will pinpoint where and when a highway shooting happened. These systems are in use around California, but this will be the first time they will be used on a freeway. They plan to install them by the end of the year.
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The system will eventually include cameras and license plate readers. The hope is to bring an end to these freeway shootings; there have been 136 of them in the Bay Area in the last three years.