Using the Canadian postal code system as an example, the top level's binding concept is the postal district, and consists of 18 objects (letters). The next level down is the zone, where the objects are the digits 0â9. This is an example of an overlapping hierarchy, because each of these 10 objects has 18 parents.
The refreshed 2014 Buick Regal GS can now be had with all-wheel drive, though the added grip does come at the expense of a few horsepower. We already sampled the 2014 Regal GS and walked away mostly impressed, but now itâs time to verify how the sedanâs powertrain changes affect its performance numbers.
The Buick has the least amount of front headroom and the worst scores for rear hip, shoulder, and headroom. It also has the smallest trunk. Don't get us wrongâthe Buick is a nice car that comes with an extra year and 50,000 miles to its warranty (everything else on this list is at 3 years/36,000 miles). But it's designed to spar with Toyota Camrys, Ford Fusions, and Honda Accords.