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Biển báo giao thông tại Hoa Kỳ
Biển cảnh báo được tìm thấy trong các bộ W của MUTCD quốc gia. Họ nhấn mạnh điều kiện hiện có, chẳng hạn như một khúc cua, trường học, đường cụt, hoặc đèn tín hiệu giao thông. Chúng cũng có thể cảnh báo nguy hiểm có thể như cái ụ, xe đạp, máy bay bay thấp hoặc xe cấp cứu. Những biển báo dùng màu vàng hoặc huỳnh quang màu vàng, phần lớn có hình thoi, đôi khi là hình vuông hoặc hình chữ nhật có dấu hiệu nhỏ hơn hoặc có tấm bảng liên kết với chúng. Hầu hết các biển báo W cũng có thể có nền màu cam, để sử dụng trong tình huống tạm thời như khu xây dựng. Một số trong những biển báo dùng tạm chỉ được sử dụng trong các tình huống tạm thời.
Bộ W1 của MUTCD là những biển báo liên quan đến khúc quanh và quẹo. Ngoài những biển báo này, một số tiểu bang có các tiêu chuẩn riêng của họ thêm vào MUTCD.
Bộ biển báo W2 của MUTCD dùng cho những biển cảnh báo về giao lộ, bao gồm vòng xoay giao thông. Vì không phải tình huống nào cũng được đề cập đến nên một số tiểu bang có thêm vào MUTCD những tiêu chuẩn riêng.
The MUTCD's W3 series of signs is for warning signs relating to advance traffic controls such as speed limits and signals. As all situations are not covered, several states have their own standards in addition to the MUTCD. The MUTCD provides options for graphic and text signs.
The MUTCD's W4 series of signs is for warning signs relating to advance traffic controls such as speed limits and signals. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W6 series of signs is for warning signs relating to divided highways. As all situations are not covered, several states have their own standards in addition to the MUTCD. The MUTCD provides options for graphic and text signs.
The MUTCD provides several signs in the W7 series dealing with hills and grades. Several states have additional signs for other types of situations not covered by the MUTCD.
The MUTCD's W8 series of signs is for warning signs relating to pavement and roadway conditions. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W9 series of signs is for warning signs relating to lane transitions. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W10 series of signs is for warning signs relating to rail and light rail. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W11 series of signs is for warning signs relating to advance warnings and crossings. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD only provides for a warning of fire stations in the W11 series. Most states have their own signs for other emergency vehicle types which may enter the road.
The MUTCD specifies no children related signs in the W11 series. Several states have signs for situations as children at play as well as deaf and blind children. Some of these signs vary from state to state as there is no federal standard.
The MUTCD provides several signs in the W11 series warning of bicycles and for signing bicycle facilities. Several states and localities have their own specific bicycle related signs as well.
The MUTCD provides several signs in the W11 series dealing with vehicles. Several states have additional signs for other types of vehicles and situations regarding vehicles not covered by the MUTCD.
The MUTCD provides several signs in the W11 series dealing with pedestrians, transit, and aviation. Several states have additional signs for other types of vehicles and situations regarding vehicles not covered by the MUTCD.
The MUTCD provides several signs in the W11 series dealing with animals. Several states have additional signs for other types of animals not covered by the MUTCD.
The MUTCD does not provide signs in the W11 series dealing with driveways and entrances. Many states have their own sign standards dealing with these situations that they place in their own W11 series.
The MUTCD's W12 series of signs is for warning signs relating to low clearances. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W13 series of signs is for warning signs relating to advisory speeds. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W14 series of signs is for warning signs relating to dead end streets and no passing zones. As all situations are not covered, several states and local governments have additional signs for other types of situations not covered by the MUTCD.
The MUTCD's W15 series of signs is for warning signs relating to playgrounds. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W16 series of signs is for supplemental plaques for warning signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W17 series of signs is for warning signs relating to speed humps. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W18 series of signs is for warning signs relating to the lack of traffic signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD does not have a W19 series of signs.
The MUTCD's W20 series of signs is for warning signs relating to work zones. These signs are typically orange background ones used for temporary situations. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W22 series of signs is for warning signs relating to blasting zones. These signs are typically orange background ones used for temporary situations. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W23 series of signs is for warning signs relating to slow traffic. These signs are typically orange background ones used for temporary situations. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W24 series of signs is for warning signs relating to Double Reverse Curves. These signs are typically orange background ones used for temporary situations. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD's W25 series of signs is for warning signs oncoming traffic having an extended green signal at a traffic light. As all situations are not covered, several states have their own standards in addition to the MUTCD.
The MUTCD does not provide signs dealing with some other road and highway situations. Many states have their own sign standards dealing with these situations.
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