As discussed, Fallout 2 was not first or even third person. It was an isometric view and you couldn't even actually drive the car anywhere. The game world was massive, like real life scale. Fallout 2's map was over 750,000 square miles. The individual locations inside the game world weren't all that large, but the game world itself was huge. You had to walk from town to town, which took days, sometimes weeks of game time. The sole purpose of the car was to reduce travel time. Like I said earlier, you couldn't actually drive the car, you would just use it as a map access which would increase your travel speed.
Here's a map of the game world overlaid on top of a real life map of california. http://i.imgur.com/vLk7M.jpgEach little square on the map represents approximately 900 square miles (30x30). The entirety of Fallout 3 takes place is far less space. I couldn't find any specific numbers but I believe I recall way back in the back when times before it came out that TH was boasting about it being something like six square miles. If you pull a real world map and overlay Fallout 3's map over top it will look a lot larger because while Fallout 3 "covered" a fairly large chunk of land, it was compressed and you could walk from the heart of DC into alexandria in less than half an hour, which is not possible irl. Since the old games didn't have open world exploration, their map was to scale and it took realistic timescales to get from one town to another, thus the car was effective.