Most litter on our highways comes from trucks with uncovered loads. This problem can be solved by a simple, inexpensive solution.
Washington has a law requiring vehicles to cover loads to prevent spillage. The law needs to be updated and enforced. A cargo net or a tarp should be required and enforced. The state should educate citizens about covering their loads and establish a high penalty. Signs could be added to “Keep Washington Litter Free” signs stating loads must be covered and the fine amount. It could be on electronic highway signs and detailed notices included with license tag renewals.
I moved here from a very clean city, Brisbane, Australia. I was shocked by all the litter on the roads here. Driving these littered roads is dangerous. I have almost run over a bicycle, large metal tray and even an ironing board. In Brisbane, I never saw large items scattered on roads because of a $200 fine for uncovered loads that was strictly enforced.
There are disrespectful people who litter from cars, but most litter comes from uncovered loads. The effort to update and enforce Washington’s “cover your load” law should not be that hard or costly.