Many places in North America (including where I live) have a rule that cars can only be parked on a driveway, and a driveway can only be as wide as the garage.

Many places in North America (including where I live) have a rule that cars can only be parked on a driveway, and a driveway can only be as wide as the garage. Combine with expensive frontage and you get houses whose fronts are almost entirely garage.