The Hong Kong Planning Standards and Guidelines (HKPSG) are part of a government manual of criteria for determining the scale, location and site requirements of various land uses and facilities applicable to planning studies, town plans and development control. They are constantly under review to take account of changes in government policies, demographic characteristics and social and economic trends. During the year, the planning standards and guidelines for pre-primary services and public mortuaries, recreational facilities, and parking standards for cars and bicycles in residential developments were revised. A new set of planning standards and guidelines on air ventilation was also incorporated into the HKPSG.