Strategies for increasing the percentage of illumination provided by natural light in a building, such as light shelves, toplighting, skylights, window, optimized building orientation and room layout, and devices used to redirect or transport light.

The number of dwelling units, buildings, or persons per unit of land, usually per acre (expressed as du/ac).

Vehicle that must regularly be accommodated on a roadway without encroachment into other travel lanes (e.g. an intersection on a transit route might be designed to accommodate the wide turning radius of the bus).

A sidewalk separated from the curb by trees, grass, landscaping, lights, or other streetscape elements.

A device used to redirect of scatter light from a source.