A design is intuitive when users understand and use it correctly and efficiently without needing instructions or prior training. Key signs include matching user expectations, requiring little explanation, giving clear feedback, minimizing thinking, maintaining consistency, and building on familiar patterns. For emergency door opening, intuitive design requires interior release control to unlock doors and unlatch without separate controls. Alternative actions for power loss must be fully intuitive, integrated or in close vicinity, within reach, and properly marked. Exterior door handles need a proper force application area for at least four fingers of an adult hand.

This document specifies testing procedures to verify door-opening systems remain functional after complete power loss. Interior testing requires unlocking, unlatching, and opening doors from inside the vehicle five times after a 60-minute wait following power disconnection. Exterior testing requires unlocking, unlatching, and opening doors from outside five times under identical conditions. All operations use only permanently installed components without tools.

Proposal as amended during the 4th EDO SIG session.

Proposal to require the electric side windows of the front seat row to function for at least ² minutes from the time of a vehicle entering water (EDO-03-08) as amended by the EDO SIG during its 4th session.