According to a UK
report on parking put out last year by the RAC Foundation
 “… there are about 25 billion car trips per year, and with some 27 million
cars, this suggests an average of just under 18 trips per car every week. Since
the duration of the average car trip is about 20 minutes, the typical car is
only on the move for 6 hours in the week: for the remaining 162 hours it is
stationary – parked.”

With 168 hours in a week, that means the typical UK car is parked 96.5% of
the time. The point? The massive savings we could reap if cars were used more efficiently such as with car-sharing or on-demand services like
taxis or Uber.