Yes I've heard of walking buses and I have seen them on Baswich and Littleworth on a regular basis. It's a good idea but sometimes this is not practical due to a lack of volunteers. A CRC would be needed for anyone involved and some people may not like it being done - even if they have 'nothing to hide'. As for taking the bus to school - do you think it's safe and appropriate for a unsupervised 5 year old to get on a bus to go to school? That appears to be what you are suggesting. And just in case you think I am only advocating taking children to school in cars - my son walked to school all through his primary years accompanied by my wife and all through his secondary years on his own.