Sometimes I wish we had standards for these across the world. One metric system (miles or km? please agree on one), standard set of traffic signs (without any

Sometimes I wish we had standards for these across the world. One metric system (miles or km? please agree on one), standard set of traffic signs (without any text), just drive on one side of the road (left or right?) etc - obviously some of these aren't practical (like driving) but some are (like establishing uniform traffic/road signs without any text, just pictures). I know it is wishful thinking :(