In the US freeways are not illuminated except near cities. The headlights of your car are expected to be able to illuminate road signs. This leads to design d

In the US freeways are not illuminated except near cities. The headlights of your car are expected to be able to illuminate road signs. This leads to design differences with US vs European headlights, with the US headlights aimed higher. The next time you see a European car with fancy advanced headlights and wonder why you can't have that in the US realize it's because in Europe they illuminate road signs.