Translate the following English sentence to French:
"This proposed directive would be an extremely useful complement to the efforts undertaken in towns and cities, especially in the form of urban transport plans, particularly in the conurbation around Rouen, which is crossed by 5 000 commercial vehicles daily."
Cette proposition de directive viendrait compléter très utilement les efforts entrepris dans les villes, notamment grâce aux plans de déplacements urbains, et en particulier dans l' agglomération rouennaise, que traversent chaque jour 5 000 véhicules lourds.