How a ‘protected nature’ sign keeps roadsides litter-free

What unsustainable behaviour needs to change:

Littering along roadsides is a persistent problem. These spaces, often seen as a ‘no man’s land,’ exist in the transition between inhabited areas and travel routes. Many motorists lack a personal connection to them, making it easier to discard waste from their cars without a second thought. The anonymity of roadside spaces leads to  psychological detachment from responsibility.

This behaviour stems from the ‘tragedy of the commons’—when shared spaces suffer because no single individual feels accountable. Additionally, ‘out of sight, out of mind’ plays a role: once rubbish leaves a car window, it’s no longer the driver’s problem.

The Green Nudge:

To shift this perception, Fama Volat collaborated with a local forester to reframe the roadside as a protected nature reserve. The intervention was simple: a brown UNESCO-style sign declaring the roadside a „Protected Natural Area.“

Why does this work? People litter less in places they perceive as valuable. A nature reserve signals an environment worth protecting, subtly encouraging motorists to keep their trash inside their cars.

The results: In multiple Dutch municipalities, the Protected Roadside sign has led to a more than 50% reduction in litter. The intervention gained media traction and is now being tested in Belgium, where the first municipalities have begun trialling the approach.

By changing how people view roadsides, this intervention turns scattered stretches of land into a collective, nationwide nature reserve—one that we can all help to protect.

Are you aware of any other nudges that help to reduce littering? Feel free to get in touch: hello@green-nudges.com