They developed a ticking mechanism that was able to take into account the time to become silent during the night, and louder during the day. they needed a box that was weather proof, restitant, and durable. The box is tactile and able to tell the layout. They tell the direction, the kind of lane (bike, pedestrian, bus, train line...) they are very contrasty to be able to be seen at a distance. And they have chosen a really big relief as a fix when people wears gloves in winter. ---- the craig machin truc doesn't know what time it is, english is the languagr