Safety signs actually cause one in 20 accidents.
The "Baby on Board" or its various variations are designed originally to alert Emergency Services to the presence of a baby or toddler in case of an accident.
Oddly enough though it seems these are a cause of many accidents according to research done by a major insurance comparison company.
Along with other clutter around windows in a car, the Baby on Board signs can restrict the view of the driver, and thus increase the chance of a accident. Obviously it’s dangerous for a baby to involved in any accident so new parents should be careful to make sure that any signs do not restrict the view. It is also a major safety improvement to keep your baby in a rear facing car seat for as long as possible. Rear facing car seats are much safer, but more expensive.
The research was based on a sample of 2,000 drivers, 46% regarded them as a hazard.
Perhaps the most safe Baby on Board sign is the one London Underground give out to mums-to-be to encourage commuters to give up their seat. Which is an excellent idea as my husband once gave up a seat to a lady who was not actually pregnant...
