some WORKplaces have a scheme like this called flexitime you can work ANY hours you choose as long as you do the minimum hours. This is turn creates a relaxed atmosphere where parents dont have to rush around to get there ids to school then to work AND it means they neatly avoid rush hour.
Speaking in the UK though "FREE Schools" just would not be a good idea as there is not enough discipline and 2 many pupils per school (even more now there closing some down.) I will say it will most likely work if itsonly involved Collegs and University's as this will relive some of the stress of having to get to places on time.