In some countries like Scandinavia it has been a rule for many years and now is every-day-life to drive with lights on even during day. What thereby is most important is not "to see well" but "to be seen well". There are many arguments that strongly support driving during day with lights on:
Daytime Running Light can contribute to...
...reduce the number of accidents as other road users are seen earlier even in bad weather and traffic conditions
...realise following road users earlier in the rear mirror and being able to adapt the own braking reactions according to minimize rear-end collisions
...pedestrians and cyclists better realizing approaching vehicles
...intensify reduced contrasts of the background that would hinder the view, like with clouds, sun reflexes, in areas with forests or trees.
There are studies that estimate the potential of rescuing human lives from a percentage of about 3 to 5 of the yearly serious car accidents.
To keep fuel consumption and CO2 emission on a relatively low level, there are special daytime running lamps, for example in BMW 3series or Audi A4. Both headlamps clearly point out the opportunity to create an extraordinary styling with new technologies.
