For clarity, what I had in mind:
One-sided enclosed footbridges: Kwun Tong Apm, Quarry Bay Station Taikoo Place, Standard Chartered Bank Battery Path 
Long `=viaduct` type examples: Tsuen Wan Station Discovery Park 

Of course, many other `bridge=covered` are mistakes...

If something is considered a `building=bridge`, thus `indoor=yes` , logically the `bridge=yes` might be redundant. This is especially the case in more significant `building=bridge` (depending on interpretation` ) eg IFC across Man Cheung St as actual "buildings" with shops inside. 