20mph Speed Limit Sign, Post Mounted Diagram 670 R2/RA220mph speed limit signs are most commonly seen in residential areas where traffic speed needs to be decreased. They can also often be seen around schools and other areas where there is a large number of pedestrians such as shopping centres and town centres. 20mph zones are perfect for areas with large amounts of foot traffic as it keeps cars at a much safer speed. Our 20 mph road signs are part of our range of road legal signs, they are produced to