“A few years ago, the Colorado Department of Transportation placed an advertising billboard high over Colfax Avenue in Denver reminding drivers to keep their eyes on the road, something that would be impossible to do while also looking at the billboard…
There is a great billboard safety study from a couple years ago suggesting that ‘Removing billboards was associated with a decrease of 30 to 40% in injury crashes, and restoring billboards was associated with an increase of 40 to 50% in injury crashes.’
That shouldn’t be surprising.”
–Wes Marshall, Killed by a Traffic Engineer, Island Press 2024, page 121
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