Predictable Use of Highlighter

These drawings were made on the move - walking, not cycling! - during a short family walk/cycle. They are mainly done (in my current A6 book) using liquid ink rollerball pens; the orange of my son's hi-vis vest was added at home with a highlighter.

The sketch opposite my cycling son is a fairly impressionistic version of the "tree-tunnel" footpath that we were following at one point.