Dallas, Texas. Dallas ZIP Code Map (Uncolored ZIP3s, Borders Only) :: MapTechnica Classic Series. Our US ZIP Code map shows the uncolored ZIP Code borders in and around Dallas, Texas. This map shows major streets, highways and interstates, and can be printed and displayed as a reference map.
North American railroad signals generally fall into the category of multi-headed electrically lit units displaying speed-based or weak route signaling.orth American signals generally follow a common layout. A high signal consists of one to three heads mounted roughly in a vertical stack, each head capable of displaying one to four different aspects. Automatic signals are identified with a number plate whereas absolute signals are not.
Definition of signal for Students. 1  1 : a sign, event, or word that serves to start some action â¦ the manager gave the signal for the curtain to go down, and the audience â¦ cheered. 2  2 : a sound, a movement of part of the body, or an object that gives warning or a command The police officer made a signal with his hand. a traffic signal.