The buildings are connected by numerous covered walkways and bridges. Andohalo square was remodeled to feature a gazebo, walkways, and planted landscaping. The city was planned under Garden city principles with numerous pedestrian walkways and open spaces. Slate tiles are often used for interior and exterior flooring, stairs, walkways and wall cladding. Students could travel to adjacent blocks by linked walkways or footbridges. It includes of walkways and plazas open to the public. The Mexico DF metro system has many underground pedestrian walkways connecting stations. The standard uses American units and applies to pedestrian queues, walkways, and stairwells. The walk is assisted by escalators and moving walkways. The recycled chips can cover paths, walkways, or arena surfaces. There are covered walkways and travellators along the boardwalk for rainy days. The Otis Elevator Company develops, manufactures and markets elevators, escalators, moving walkways, and related equipment. Terminal 3 has 243 elevators, escalators or moving walkways. There were over 1,500 buildings, connected by some of roads and walkways. All would be connected by an intricately planned set of walkways and bridges.