<P> The signage for advisory speed limits is not defined by the Vienna Convention on Road Signs and Signals , and is therefore not standardised internationally . The United States uses a small yellow sign under the main warning sign , as well as a standalone variation on the standard speed limit sign , with a yellow background instead of a white one , the words `` speed limit '' omitted and an additional panel stating the type of hazard ahead . Though they list speeds , the U.S. advisory speed signs are classified as warning signs , not regulatory signs , as primary speed signs are . Australia uses a similar design as the U.S. in spite of regulatory speed limit signs being quite different . Germany used a square sign with a blue background and white lettering , similar to the minimum speed limit sign , and New Zealand uses a yellow background with black lettering ( similar to the Australian design without the `` km / h '' lettering ) . The United Kingdom currently uses an oblong white rectangle with black lettering stating `` Max Speed '' . </P>
what does a yellow 35 mph sign mean
advisory speed limits