RIYADH, 13 May — The Arriyadh Development Authority has signed a contract with a German consultancy company to prepare a study for an experimental project for the capital city’s public transport system, Abdul Latheef Al-Sheikh, member of ADA and the head of the project and planning center of ADA, said yesterday. Riyadh’s Urban Studies Center will also participate in the study, which will take seven months to complete. The project is one of the major recommendations of a recent workshop organized by the authority.