Industrial space for manufacture, storage and distribution can range from a small container unit to a cavernous warehouse. Temperature-controlled facilities are required for some goods and machinery, and temperatures should also be kept at a comfortable level for employees. Good transport links are important to ensure speedy distribution and an uninterrupted supply of parts or raw materials, especially if the goods produced are perishable. Many industrial units are situated in out of town industrial parks, where there are no residents to be disturbed by noise or inconvenienced by heavy traffic. Out of town locations are also more easily accessible by goods vehicles.