Is it possible to not have roads displayed in an OpenStreetMap? For instance, using this code (see How to get map to show only desired portion):
library(maps)
library(OpenStreetMap)
mp <- openmap(c(33,-95), c(43,-73),zoom=8,'stamen-watercolor')
states_map <- map_data("state") %>% filter(lat > 33 & lat < 43 & long > -95 & long < -73)
states_map_merc <- as.data.frame(projectMercator(states_map$lat,states_map$long))
states_map_merc$group <- states_map$group
counties_map <- map_data("county") %>% filter(lat > 33 & lat < 43 & long > -95 & long < -73)
counties_map_merc <- as.data.frame(projectMercator(counties_map$lat,counties_map$long))
counties_map_merc$group <- counties_map$group
OpenStreetMap::autoplot.OpenStreetMap(mp,expand=FALSE) +
geom_polygon(data=states_map_merc, aes(x=x,y=y,group=group), fill="black",colour="white",alpha=0, size=.7) +
geom_polygon(data=counties_map_merc, aes(x=x,y=y,group=group), fill="black",colour="white",alpha=0, size=.2)
...is it possible to get rid of the roads on the map while not modifying the zoom level?

