The Department of Public Works document discusses city policy on signs related to children at play. It states that "Children at Play" signs are not official traffic signs and can create a false sense of security. Lowering speed limits below 30 mph on residential streets would be illegal. Signs restricting commercial vehicles over 3,000 pounds are only used where there is documented heavy traffic not serving local needs. Overall, the city believes the most effective safety measures are enforcing existing laws and educating children and parents rather than relying on misleading signs.