It would be very useful to know at a glance which roads are unpaved, especially the more local ones, such as highway=unclassified, highway=residential, and highway=service (and depending on the area of the globe, it might also be useful for unpaved highway=tertiary and highway=secondary). This is especially useful when nearby roads of the same type are paved and others are not. It might be enough to simply make the unpaved ones a bit darker, for example by changing their color from white to light gray.
It would be very useful to know at a glance which roads are unpaved, especially the more local ones, such as highway=unclassified, highway=residential, and highway=service (and depending on the area of the globe, it might also be useful for unpaved highway=tertiary and highway=secondary). This is especially useful when nearby roads of the same type are paved and others are not. It might be enough to simply make the unpaved ones a bit darker, for example by changing their color from white to light gray.