Let drivers know to Slow Down with Slow Down Signs from SafetySign.com. Sometimes motorists forget they’re off the highway and are traveling in a residential area. Taking an hour commute at 65 to 70 mph on the highway, the driver’s mind may be tricked into thinking 55 is a slow traveling speed. Remind them, that 55 mph is not an appropriate speed where pedestrians are walking their dogs or children are playing in the streets. Let drivers know to slow their speeds and to get home safely with Slow Down Signs from SafetySign.com.