So far in early August in the USA, there have been 39 deaths of children left or found in cars (some that they get into on their own, so an important reason to check cars often before and after using them and to lock the car and keep windows and doors closed to prevent someone from climbing in to hide etc.) Safety advocates are promoting better standards for the auto industry yet more can be done by parents, drivers and communities at large in every state.
We could promote having a Doll or Toy large enough (and with a tee shirt with the child's name on it) that a person puts in the car seat