DerbyBorn wrote

Sometimes one sees ideas when on holiday and it makes you wonder
why the idea is not more commonplace. An obvious one to me has been
count-down displays on Traffic Lights (and/or the Pedestrian Light)

Yeah, useful idea.

An idea I just saw in Italy was Pre-cast Curb Stones with a tongue and
groove a the end so they interlocked. Must make installation easier.

We pour ours into formwork.