I Don't Understand

I commute to work every day. Back and forth, everyday. Same roads, same time, same cars around me. Depending on the season, it takes me 30 minutes to an hour to get to work. During the school year, its an hour. During the summer, 30 minutes. Are there that many teachers? I don't understand why traffic TRIPLES(at least) during the school year. Around the schools, sure I can see it. Anyway, thats not the point here. Most of the roads I commute on are 2 lane roads. All of them need to have more lanes. So I'm pleased when they start working on making that happen. What I don't understand is why they waited to start until THE FIRST WEEK OF SCHOOL when the traffic TRIPLES(at least)! It makes absolutely zero sense and drives me bonkers.