[jeroenhd]

kph seems to come from people that normally work in miles but switched to metric for one reason or another. The common notation I almost always see for kilometres per hour would be km/h, in rare occasions with `h` exchange for whatever letter the local translation of "hour" starts with.

I don't think anyone would confuse kph for kilograms per hour (after all, that would be kgph or kg/h, and I don't think I've ever had to calculate kilograms over time outside high school anyway). Usually, context clues make it pretty clear what's being described.

[Tor3]

There's no confusion, the problem is simply that seeing "kph" automatically expands to "kilos per hour" in non- native English brains. That's overridden by logic, obviously, but that jarring effect is always there.