Complete the summary below. Choose NO MORE THAN TWO WORDS from the passage for each answer.

The impact of driverless cars

Figures from the Transport Research Laboratory indicate that most motor accidents are partly due to [1], so the introduction of driverless vehicles will result in greater safety. In addition to the direct benefits of automation, it may bring other advantages. For example, schemes for [2] will be more workable, especially in towns and cities, resulting in fewer cars on the road.

According to the University of Michigan Transportation Research Institute, there could be a 43 percent drop in [3] of cars. However, this would mean that the yearly [4] of each car would, on average, be twice as high as it currently is. This would lead to a higher turnover of vehicles, and therefore no reduction in automotive manufacturing.