Arrow boards

economic >> efficient >>  affordable >> durable >> intelligent traffic calming solutions >>> site search     Arrow Boards TCA has a complete range of traffic calming products and services. If you need more information about Arrow Boards, give us a call or fill in our form and we will be in contact with you shortly. Did you know? The first "Don't Walk"' signs were installed in New York City on 5 February 1952. Red remained the preferred color for warning signs because red elevates the blood pressure, heightening nervous tension, therefore the most likely color to attract attention. Yellow is used in signs aimed at vehicle traffic because it is the most visible color in the spectrum and can be seen from the farthest distance.