Mandatory Road Signs: Mandatory Signs, which prohibit people from taking certain actions or put any kind of limit are called Prohibitory Road Sign. Prohibitory signs have circular shape. Though there are few exceptions to circular shape convention, STOP and YIED / GIVE WAY are examples of such exceptions. They have red coloured border and background in white colour. In the middle of sign a symbol is drawn in black colour, which is crossed by a red coloured line. Mandatory Sign are like orders that every user of road and related services has to comply with. Failure to obey mandatory signs can have dangerous results and it may cause harm of life and property. Disobeying Mandatory Signs is considered violation of traffic rules and offenders may be punished. Type and quantum of punishment will depend upon the rule that has been violated and harm it may have caused.