Litter along our nation's highways.

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27. Here in Florida, they had a program where groups or people 'adopt' roadways

And walk along, picking up garbage. Unfortunately, a lot of the groups that were originally enthusiastic have dropped off over the last decade or so. It's too bad, because when people learned how much trash there is thrown out, they tend to reduce what they dump and influence their friends into doing that, too.

Adopt a Highway Program

Volunteers enter into a two-year agreement with DOT, during which they agree to conduct litter removal at regularly scheduled intervals. Many miles of highway are adopted statewide by various organizations, allowing civic-minded people to make a difference in their communities. This eases the load of DOT work crews, enabling them to devote more time to other road maintenance and special highway projects.

Volunteers Agree to:

"Adopt" a two-mile section of a State Highway
Dedicate two years to the program
Follow specified DOT safety regulations
Remove litter a minimum of four times each year

More: https://www.fdot.gov/maintenance/aahinfo.shtm