Bus routes operating in DC or Maryland use only a number, or a letter and a number, as noted below.
The two main types of carpet construction are defined by the way the carpet fibers are attached to their backing. Loop pile means the fibers are bent into little loops. Itâs a very durable, stain-resistant carpeting, but has a low profile and limited cushioning. Level loop is also called Berber.
These are very durable carpets and usually a good choice for high-traffic areas. There are two types of loop pile carpeting: 1  Berber features large, uncut loops of natural-tone fibers varying in size and usually made from wool, nylon or olefin.