From the mid to late 1980s, the most ubiquitous road sign didn’t advise you to stop, obey the speed limit, or be mindful of crossing deer. Instead, it was diamond-shaped, used a black-on-yellow color scheme, and came with a stern warning for nearby drivers: There was a baby on board. It was such a fad to have one of these! Did you have one?
The suction-cupped alerts that stuck to a car’s rear or side windows were originally designed to notify surrounding traffic that an infant was in their midst, the idea being that drivers would either slow down or take note that a fatigued or distracted parent was operating a motor vehicle ahead of them. In the summer of 1985, barely a year after its debut, the Baby on Board sign had been affixed to more than 3 million cars, with 500,000 being sold each month.