This year marks the 35th anniversary of Volvo’s introduction of the Integral Sleeper, the first North American conventional truck model to offer a modern, streamlined design and a fully integrated sleeper compartment. Aerodynamic design directly affects fuel efficiency, reducing fuel costs for trucking companies, and reducing greenhouse gases. Environmental care has long been a Volvo core value, a position formalized at the 1972 United Nations Conference on the Human Environment, long before care for the environment became a trendy mainstream corporate aspiration.