First test post and video.. A small first reference about tactile paving.

From wikipedia:
Tactile paving (also called truncated domes, detectable warnings, Tactile Ground Surface Indicators, detectable warning surfaces) is a system of textured ground surface indicators found on many footpaths, stairs and train station platforms to assist blind and vision impaired pedestrians.
Obviously some citizens of Patra care more for their bikes than for people with vision problems who suffer when they dare to walk in a town with tactile paving