Glossary

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Paratransit(also: Demand-responsive transit, Dial-a-ride)

A flexible, on-demand public transportation service that provides rides to people with disabilities who are unable to use fixed-route bus or rail systems. In the United States, the Americans with Disabilities Act requires transit agencies to offer complementary paratransit…

Passive Accessibility Sensing(also: Automatic Barrier Detection, Breadcrumb Sensing)

A data collection approach that uses smartphone sensors (GPS, accelerometers, gyroscopes) to automatically detect potential accessibility barriers in the physical environment without requiring active user input. By analysing patterns in pedestrian movement data — such as…

Pedestrian Crossing(also: Crosswalk, Zebra crossing, Pedestrian crosswalk)

A designated location on a road where pedestrians have legal priority, guidance, or protection to cross, typically marked by paint (zebra or ladder stripes), signs, or signal-controlled infrastructure. Pedestrian crossings range from unmarked mid-block crossings through…

Pedestrian Safety(also: Walking safety, Vulnerable road user safety)

The field and practice of protecting people who walk — including those with disabilities, older adults, and children — from injury and death in road traffic environments. Pedestrian safety encompasses road design (crossings, curb ramps, accessible pedestrian signals, raised…

Personal Delivery Device(also: PDD, Delivery Robot, Autonomous Delivery Robot)

Personal delivery devices (PDDs) are small autonomous or semi-autonomous robots that travel on sidewalks and pedestrian pathways to deliver food, packages, and other goods. These devices have been granted pedestrian status under traffic code in several US states, giving them the…

Project Sidewalk

An open-source web-based crowdsourcing tool developed at the University of Washington that enables volunteers to virtually audit sidewalk accessibility using Google Street View panoramas. Contributors label four types of accessibility features and problems: curb ramps, missing…

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