I commute 1 1/2 hours in the morning, 2 hours in the evening, every day (public transportation, though). My train comes in at 5:42, and I have to pick up DD at after school care before 6.
Before I accepted the position a year ago (it is a perfect position from a career and salary standpoint, and I had been unemployed for 6 months), DH and I sat down with the kids and talked long and hard about what it would entail for him and the kids (DD10 and DS16). So far it's been fine (and they've ALL become much more responsible!), but the commute wearies me.
If you do take the position, you need to be sure to develop a "what if" scenario with the kids. "If I'm late, this is what you need to do." As long as they know to wait, to go to a neighbor's, to get the key in the garage, it will be fine.
And visit your local library for books on CD! Put the car time to good use! Best wishes.