Paul Watters, head of roads policy at the AA, has told the Sunday Telegraph that "most accidents" on the road happen in the dark.
We do know that most accidents happen in the dark. It's also comforting for people, especially if they arrive back from somewhere in the night, when they have got a late train.
There are also suggestions that it increases crime. So it may save money in terms of energy but then you have to look at the cost in terms of security, safety and accidents, it may actually be more.
More top news
More is needed to help overcome poverty and inequality in New Orleans, 10 years after Hurricane Katrina devastated the area, Obama has said.
WARNING: Some people may find images upsetting.
Hundreds of people are feared to have drowned after a boat packed with migrants sank off the coast of Libya, trapping many in the hold.