Did you know that in many countries it's against the law to run your car during the daytime unless your car bulbs are lit?
Sounds crazy, right? But many scientists argue that the more visible you are, the better other motorists will be able to see you and then accidents can be avoided.
These lights are called 'daytime running car lights' and this basically means that they stay on all of the time. Have you ever seen a Volvo? You know how their lights are always on? That's right, daytime running car lights, because Volvos are from Sweden which is one of the countries where you need them by law.
It makes sense really. Countries like Sweden and Russia are known for their poor and extreme weather. Therefore if you equip cars to permanently be more visible, even when a snap blizzard comes in or during the winter when it is dark for most (or all, in the Arctic) of the day, you will be able to see and be seen!