At least one person was injured during the incident. An ambulance was seen driving away from the scene with a patient inside.
The show began its sixth and final season on Sunday on PBS.
A camera system will work in tandem with one of about a dozen “weight-in-motion” sensors embedded in the asphalt.
A Plainfield Police spokeswoman said it could possibly take six or eight months to figure out who’s behind the threats.
Police believe Kevin Watkins killed 15-year-old Timmee Jackson and 16-year-old Dionne Williams.
Soon afterward, officers stopped a car at 30th and Ritter. Authorities believe the person in that car is the suspect.
Officials said the victim suffered minor injuries during the crime and was checked out at the scene.
“Even if you weren’t friends or didn’t know each other, people are getting together so quickly helping everyone out.”
“My first reaction was how awful it is.”
Lawmakers are expected to debate the issue during the 2016 session.