<P> Mandatory signs are road signs which are used to set the obligations of all traffic which use a specific area of road . Unlike prohibitory signs , mandatory signs tell traffic what it must do , rather than must not do . Most mandatory road signs are circular , may use white symbols on a blue background with white border or black symbols on a white background with a red border , although the latter is also associated with prohibitory signs . </P>
<P> Mandatory signs are road signs which are used to set the obligations of all traffic which use a specific area of road . Unlike prohibitory signs , mandatory signs tell traffic what it must do , rather than must not do . Most mandatory road signs are circular , may use white symbols on a blue background with white border or black symbols on a white background with a red border , although the latter is also associated with prohibitory signs . </P>
what is the shape of mandatory traffic signs
what is the shape of mandatory traffic signs
circular
circular