The time at which motorists are required by law to switch their vehicles' lights on.
〈英〉（车辆的）法定开灯时间（根据法律规定汽车驾车人必须打开车灯的时间）
Example sentencesExamples
It was Grey who looked out of his Foreign Office window at lighting-up time on Aug.4, 1914, and said with melancholy prescience: ‘The lamps are going out all over Europe; we shall not see them lit again in our lifetime.’
As in Paris, they would be lit for 10 minutes every hour, from lighting-up time to 1am.
A better option is to fit a photo-electric switch which operates automatically, regardless of lighting-up times.
We looked at lighting-up times, getting later and later with only a very few hours of twilight to play with.
However, variability in traffic patterns and other factors meant it was difficult to present ‘before’ and ‘after’ time scenarios for all sites because demand patterns, weather conditions and seasonal effects (e.g. lighting-up times) were not all identical.