This is the (funny) story of four agents of Roma traffic police in the '50s. Their life are crossed in affairs that often retire from mere job relationships. 'Guardia scelta' (special agent) Giuseppe tries to be a composer, he wants to write the anthem for the roman traffic police. 'Guardia'(agent) Alberto Randolfi has a too strong inclination to fine everyone and is dreaming about learning French. 'Brigadiere' (sergeant) Pietro Spaziali is busy looking at his little son Tonino and daughter Maria who is going to marry a boxer. The 'Maresciallo' (Marshal) tries to manage and solve all the troubles they often do.
| Directing | Mauro Bolognini | Director |
| Writing | Paolo Frascà | Story |
| Editing | Roberto Cinquini | Editor |
| Production | Luigi Rovere | Producer |
| Writing | Ruggero Maccari | Screenplay |
| Writing | Ettore Scola | Screenplay |
| Writing | Nicola Manzari | Screenplay |
| Art | Flavio Mogherini | Production Design |
| Costume & Make-Up | Elio Costanzi | Costume Design |
| Art | Arrigo Breschi | Set Decoration |
| Camera | Enrico Betti Berutto | Camera Operator |
| Sound | Ovidio Del Grande | Sound |
| Directing | Mariano Laurenti | First Assistant Director |
| Production | Mario Gabrielli | Unit Manager |
| Camera | Aldo Giordani | Director of Photography |
| Sound | Carlo Rustichelli | Original Music Composer |
| Sound | Alberto Paoletti | Conductor |
