Of course I don't know your personal circumstances and reason to undertake such a road trip with what seemed like little buffer time. Nevertheless, I would haven't risked it - especially in the evening rush hour. There can be horrendous jams in and around most large cities in the morning and evening rushes and I take that well into account with my planning. One of my "local" airports (Brussels) is just over one hour's drive away from my home. It only takes a little bump on the motorway in the rush hour and bingo the travel time doubles or even trebbles. If on flex tickets no problem but on cheapos you have to build in a good buffer to avoid expensive surprises. I even fork out for a nearby hotel if necessary when on flights departing in the 0800-0930band.