Why did the need for parking assistance increase around the time of the late 1980s invention?

Answer

Vehicles were becoming larger and had less rear visibility

The timing of the invention coincided with vehicles generally becoming larger and often having reduced visibility out of the rear, increasing the utility of such a device for everyday drivers.

Why did the need for parking assistance increase around the time of the late 1980s invention?
inventiontechnologyautomotivecreatorparking sensor