but one prob is there...as these are children also monitored by school authority probably yet if some accidents are happening in the yard then who'll take the responsibility? also looking @ the pic,they've literally blocked the whole yard & not only thorugh pass,even shunting work will also be affected...so definitely children should participate in such awareness work but not in a large scale...may be 5-10 in a group max per day.
Nevertheless hats off for their effort!!!