noun
outdoor parking; street parking; unauthorized outdoor parking
Often implies parking in an open area without a roof or in an unauthorized spot, such as on the street or in a vacant lot. Can carry a negative nuance of improper or illegal parking.
駅前に青空駐車している車が多い。
There are many cars parked on the street in front of the station.
この辺りは青空駐車が禁止されています。
Outdoor parking is prohibited around here.
Compound of 青空 (aozora, 'blue sky') and 駐車 (chūsha, 'parking'). The term evokes the image of parking under the open sky, often with a nuance of being exposed or unauthorized.