ZBEDEP stands for Zona de Bajas Emisiones de Especial Protección, which means Special Protection Zone with Low Emissions.
There are two of these zones in Madrid: the ZBEDEP Distrito Centro and the ZBEDEP Plaza Eliptica.
In the one mentioned first only vehicles with an ECO emissions sticker are allowed to enter.
The second one requires a Spanish emission sticker B to be allowed to enter.
There is also a LEZ (ZBE) that will gradually cover the entire municipality.
For more information on this zone go to our Madrid page

Source: Pixabay