The chapter discusses the factors to be taken into account in designing mobility technologies and the reasons for the long cane, followed by the guide dog being the two main travel aids despite the potential of modern technologies. It stresses the importance of user rather than technology-driven approaches and the involving blind, partially sighted and deafblind people throughout the design and development process. It discusses how blind people travel, learn routes and recognise object and the benefits of taking this into account when designing travel aids. The chapter presents a number of classifications of travel aids and three phases of their development including details of some of the underlying technologies and the aids involved. These are obstacle avoidance systems, mainly involving different types of canes; navigation and wayfinding devices, largely based on satellite systems, particularly global positioning systems (GPS) to identify the user’s position and beacons or tags to identify a position in space; and apps for smart mobile devices segueing into camera vision, wearable devices and apps on smartphones and other mobile devices. Discussion of the factors that lead to device acceptance and rejection is used to motivate the presentation of a number of principles of good design practice, covering end-user factors, functionality and features, the design approach and information and training. The chapter also consider design issues related to device functionality and privacy, as well as the design issues related to the different sensor and interface options.