afaik in rural context, `highway=secondary` must have some sort of cross-district capability (e.g. Kam Tin Road, etc.). I don't see Kam Ho Road has this.

But, we might in another occasion consider promoting Kam Ho Road separately with justification as "Grand Mayfair wants access to Route 3", just as how some time ago Sai Sha Road got partial-promoted to `highway=primary` with justification "Sierra Sea et-al is big & has improved road works".