It shall be the intent of this chapter to prevent traffic congestion and to provide for proper traffic safety by preserving the public thoroughfares for the unimpaired movement of pedestrian and vehicular traffic. Therefore, it shall be recognized that the requirements of this chapter are minimum and that in certain uses of land, these requirements may be inadequate. Where review of the site plans and intended land use indicate through the application of proven standards or experienced statistics that the requirements herein are inadequate for the specific land use adaptation, a greater requirement for off-street parking space is justified and may be required to preserve the intent of this chapter.