#399: The U.S. spends approximately $2 Billion a year on road markings, the most prevalent being lane markings. While you can’t really quantify the safety benefits of these markings, it’s generally safe to say that lane markings play a critical role in helping drivers safely operate their vehicle by identifying the boundaries of each lane. ‘Lane' markings can play a critical role in you marriage as well with regards to boundaries you should respect for a great marriage.