Some other tips;
Choose the time of the day. Driving into the sun will guarantee bad pics. Taking pics while it rains too, ofcourse. Also, bugs on the windshield can be a problem, and there's not much you can do to avoid it, just regularly stop on long trips to clean the windshield. Wiper blades are usually not sufficient to remove the dead bugs.
Also, if you're further to the north, taking pics from october to march isn't really a good option, because of the less sunlight, and the sunlight that does exist is at a lower angle, so it's usually only possible to make good pics during a few hours of the day, when the sun is the highest on the horizon.
Take pics westbound in the morning, and eastbound in the evening. Northbound pics usually come out best, and you can take those nearly all day. Southbound pics are usually worse during most of the day, but often doable when it's cloudy, but not dark (summer)