The highway to the south of the apartment where I live is called the "Japan-America Common Use Zone." The cars lined up are with people who have come for cherry blossom viewing in the forest park.
The road on the northern part of the mansion where I live is a "Japan and US joint usage area". There are cars that are lined up in the forest park where people come to view the cherry blossoms.
The road on the south side of the apartment I live is "Japan-US joint use area". The cars parked queueing up are those of people who visited to see cherry blossoms in the forest park.