Boot’s research team found that installing more countermeasures ahead of exit ramps helped, but additional warnings were needed to grab motorists’ attention once they started driving in the wrong direction. The next line of defense would be to install alerts that could cause wrong-way drivers to recognize their mistake, stop driving and turn around.

The team, working in collaboration with the Center for Urban Transportation Research at the University of South Florida and Florida International University, evaluated seven high-tech countermeasures. They included radar-triggered blank signs that immediately lit up when they sensed wrong-way motion, as well as bright beacons that flashed asynchronously.
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Read more at: https://phys.org/news/2018-10-smart-highway-wrong-way.html#jCp