Gas Stations
You should familiarize yourself with the Gas Stations wiki - specifically naming, branding, and stop points.
Also understand, that to provide the best navigation instructions for a Wazer, u-turns should be enabled at each end of the PLR drawn through the gas station.
Cemetery
Not mapped. Handled by POI Search. Those with historical significance can be mapped. Internal roads should be mapped using the Parking Lot Road type if roads are warranted.