(1) Cost. Building roads and highways inflicts both huge upfront capital costs and maintenance costs. A typical highway line has a throughput of 2,000 cars per hour. (2) Real Estate. Building the level of roads necessary to meet induced demand+ would take up an extremely large amount of land that can only be used for vehicles. (3) Local Roads. Local roads can only absorb so much capacity and they have functional throughput limits. If you wanted to make them faster, homeowners couldn't have driveways.
If you really wanted to, you could possibly make a city where driving is king and there is effectively no congestion. It would just be absurdly expensive and hostile to everyone who doesn't have access to car.