If you eventually plan to take all four parts of the exam, you can check all four boxes. After you pass one part of the exam you have 18 months to take and pass the other three parts. See the 18 month requirements below (How do I calculate the 18 months rolling window?).
Though you may not notice, as bulbs age they don't generate as much light as when they were new. That means your headlights may still work after five or six years, but they may not be as bright or illuminate as much of the road as they used to.
1 Most states require that their drivers have two functioning headlights on the vehicles. 2  You must turn on your headlights when it becomes dark outside. Some states require headlights to be turned on 30 minutes after sunset until 30 minutes before sunrise.  Headlights must be turned on when visibility is low.