In the article on Quartz.com, which argues that parenting has become an all-encompassing religion, “Baby on Board” signs are held up as a key example of how our culture values the lives of infants above all others.

Nobody would have placed such a sign on a car if it were not already understood by society that the life of a human achieves its peak value at birth and declines thereafter. A toddler is almost as precious as a baby, but a teenager less so, and by the time that baby turns fifty, it seems that nobody cares much anymore if someone crashes into her car. You don’t see a lot of vehicles with placards that read, “Middle-aged accountant on board.”

The accountant joke aside, there’s a serious point to be made here. While babies are more vulnerable to injury, shouldn’t we be driving carefully no matter who is on the neighboring car?

The baby-on-board sign has more to do with the car holding it than with other motorists - kind of like saying, please be patient with my driving; there's a baby on board so I'm driving a bit slower and being more cautious, ergo, don't honk your horn unnecessarily, or drive too closely behind, or try to cut sharply into my lane from the front.

It basically works the same way as with a car carrying the 'L' sign.

Unfortunately in Nigeria, most motorists don't give a sh1t what sign you're carrying - the only cars they're careful around and fearful of are those with law-enforcement sirens.