This Portugal-Spain-France tour is our second self-guided long trip, following the one we did in Switzerland last September. The main difference, however, is in the means of transportation. While in Switzerland all our travel took place over their convenient, highly efficient railway system, our P-S-F cross-country travel relied mostly on our own driving.
The European roadways are well laid-out and maintained in general. Narrower country roads and city streets than the States', of course, but neat and well-signed highways with smooth and even pavement that beat the riding comfort of some bumpy freeway sections in California .
It's got many toll stations, though. Even though we had purchased the transponder option with the car rental company that supposedly would take care of the toll payments, it still took us on-the-spot decision-making to select which lane to go through without stopping, which to take a ticket and return it at the next toll station, and which to just pay with credit card, etc.
And you have to be skillful at driving through many round-abouts they put in place of straight traffic lights. Merge into the circling traffic at right timing, then pick the first, second, or third... exit to get out in a few seconds. Make a wrong exit, and you'd need to drive to the next round-about a couple kilometers down the road to round back to the right path. No easy U-turns.
Driving through the European continent, I was surprised by the barrenness and sparse human presence of northern Portugal/Spain border that rivaled the wilderness of America Southwest, the vast and straight fields of farmlands in Spain and France, the rolling greens in southwestern France, and the tree-lined, cottage flanked country-road scene in Loire Valley that looked like a Romantic landscape painting.



And there were people we met: the captain and his mate of the boat that took us for the cruise on the Douro River, the chateau hosts that provided bed and breakfast for our stay in countryside France, the village restaurant owner trying so hard to explain her dinner specials in minimal English, a young man giving us street direction in San Sebastian, another on how to take a bus in Porto, a supermarket clerk in a no-name little town letting us use their restroom, and a Frenchman who volunteered to translate between us and the train conductor when we lost one of our luggage on our way to Paris... People are kind and good-hearted, ready to give help if you let them.
Like the Switzerland trip, this one was master-planned by my high school best friend Joseph and his wife Peipei, the best companions in a long trip like this. Together we learned how to explore extensively without overextending ourselves, improvise instead of being stuck with a rigid plan, and problem solving when things went unexpectedly. Thank you again, Joseph and Peipei! We are now two for two: one by train and this one by car, maybe we should do next one by boat (a cruise) 
God bless!
Be triumphant!