Things that can help reduce speeds: - narrower lanes - less shoulder/median space - trees, bushes - traffic circles instead of red/yellow/green signals - various curbing arrangements
Since pedestrians don't have signaling apparatuses, the only way to share the parts of the road that must be shared is to clearly see everyone.
Common example I'm used to seeing is narrowing of the roads and causing a slight bend at various points to essentially 'force' you to slow down. It's not technically causing you to slow, but you feel much more comfortable going slower when transitioning through the calmed area. No speed enforcement needed... just some small changes to the road.
