In-vehicle parking meter

An in-vehicle parking meter (IVPM) (also known as in-vehicle personal meter, in-car parking meter, or personal parking meter) is a handheld electronic device, roughly the size of a pocket calculator, that drivers display in their car windows either as a parking permit or as proof of parking payment. IVPM was first implemented in the late 1980s in Arlington, VA, and is spreading to campuses and municipalities worldwide as a centralized method of parking management, revenue collection, and compliance enforcement.

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