My Mum is Queen of the Road

Ari and Isabella play with trucks and diggers, making roads in a sandpit. Ari tells Isabella that his mother is a roadworker who works the Stop/Go sign and is called Queen of the Road. Isabella tries to work out why she is a queen does she wear diamonds? Does she sit on a throne? Does she have a corgi? Each time, Ari answers no, and Isabella is puzzled until Ari reveals that when his mum turns her sign to Go, everyone cheers and waves at her just like a queen.