A pedestrian signal is a traffic control device indicating when pedestrians may safely cross at signalized intersections. Signals display walking figure symbols (proceed with caution), flashing or solid hand symbols (don't start crossing), and may include countdown timers showing seconds remaining. Accessible pedestrian signals (APS) include audible tones and vibrating surfaces for people with vision impairments. Pedestrian push buttons activate crossing phases at many intersections, while others include pedestrian phases in regular signal cycles. Signal timing must balance pedestrian crossing time needs against vehicle traffic flow. Municipal transportation departments install and maintain pedestrian signals as part of intersection infrastructure.