Välkky is an active, intelligent traffic indicator that can be used to improve the safety of pedestrian crossings. It warns drivers when a pedestrian or cyclist is approaching the crossing, giving the driver time to react.
Mounted to a crossing’s existing traffic signs it offers protection for pedestrians and cyclists traveling in both directions. When something comes into the target area, the device’s blue and white LED lights begin to flash, attracting the attention of approaching drivers to let them know someone is about to cross.
(via Adam Greenfield at Cognitive Cities)