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.
In 1963, Kaiser Jeep debuted an innovative four-wheel drive setup paired with an automatic transmission and independent front suspension on the Wagoneer. In 1966, we saw the origins of all-wheel drive on the Jensen FF sports car, which used the first permanent 4Ã4 drivetrain. These innovations have paved the way for four- and all-wheel driveâs astonishing popularity today. Whether people actually need four driven wheels or not, this setup is largely viewed as a premium feature.