RH = Right Hand (Passenger Side)
This means it’s for the “Right Hand Passenger Side”.
What side is the off side of a car?
So the Near-side of the car is the Passenger’s side and the Off-side is the Driver’s side.
What countries drive on the left side?
Europe generally drives on the right hand side apart from the Cyprus, Ireland, Malta and the United Kingdom. Guyana and Suriname are the only countries in South America to drive on the left. About two thirds of the countries in the world drive on the right including the USA, China and Russia.
Why Japan drives on the left?
Why Japan Drives on the Left
This practice goes back all the way to the Edo period (1603-1867) when Samurai ruled the country (same sword and scabbard deal as before), but it wasn’t until 1872 that this unwritten rule became official. In 1872 the first Japanese railway was up and running thanks to the British.
Photo in the article by “George W. Bush White House”