pebble road map

Quick answer：

A 'pebble road map' likely refers to a road map that features pebbles as a decorative element or metaphor. In this context, it could be a visual representation of a journey or a plan, with pebbles symbolizing the path or milestones. The term might be used in the context of graphic design, art, or storytelling, where pebbles are used to create a unique aesthetic or convey a deeper meaning.