Slow down road signs in the UK include ^{1 2}:

• Stop Sign: Indicates you must come to a complete stop before the sign and give way to all other traffic before proceeding.
• Give Way Sign: Indicates you must slow down on approach and give way to all other traffic nearing the junction. You don’t have to stop if you are alone on the road.
• Road speed limit sign: Displays the road speed limit inside a red circle with a “SLOW DOWN” message below.
• Speed Indicator Device (SID): Displays a “SLOW DOWN” message should a motorist be travelling above the speed limit, however the numbers above will reflect the exact speed of the approaching vehicle.