In our story, Renate does not see a stone in the road. It would not have been all that dark in July 194, but it would have been difficult to see and it is likely that she would not have had a battery for her cycle lamp. Notice that the local Policeman was more worried about the family having a door open letting light out than that an “enemy alien” had been out after curfew.
The Blackout started on 1 September 1939, though was quickly revised in November 1939 because of the many accidents that happened. Accidents included people falling into rivers or being hit by cars.
As well as streetlights being turned off, road signs and railway signs were removed. People had to put dark black curtains up to their windows. This cost a lot or money and didn’t always work. Sometimes windows were painted black or covered in card. This shut out daylight as well and caused low morale. Firms that had glass roofs had to paint them black. This was very costly.