You have to understand that most people start work at 8 and many start earlier. For this majority that means they are on the road by 7:30 - which is rush hour. This means they are probably awake by 6:30 or earlier in some cases. So they already begin in the dark. Now imagine that going for even more time, until 8:30?
At least this way you get some Sunlight before you're at work and some when you're done.