Having never had the opportunity to gaze into a righthand drive modern vehicle, how are the pedals arranged as compared to lefthands? Same thing goes for automatic gear shift, turn signals .... just curious. I see righthand drives once in awhile but never in a parking lot where I can go look.
the post office jeeps everything was the same as left hand drive
Thankfully right hand drive cars have the same pedal arrangement or in my case left hand drive cars have the same as ours so its easy to hop in and drive away. Sometimes the gear lever is on the other side of the steering column. my first Left Hand Drive was a Pontiac Tempest in Australia and the biggest issue I had was I would look up to the left to check the rear view mirror. You tend to really concentrate on the fact your driving on the wrong side of the car. I have a both a LHD T and a RHD T but haven't driven the RHD yet, there will be some issues like the retard/throttle are the opposite way around etc. The most irritating is the blinker lever.
I have several cars & swapping over can be funny. English, Japanese, Australian cars is what we mostly have here in New Zealand and the blinkers (indicators) are on the right and the wipers are on the left. European cars imported here are right hand drive but the blinkers are still set up the other way so when I hop into my Volvo often at the first corner my wipers go instead of a blinkers.
As Kevin said above. RHD pedals are the same a LHD cars. Gear changes, both manual and auto, are in the centre of the car (so far all the same as LHD cars). Only confusion can be blinker/wiper levers. In RHD they can be on either side depending on country of origin.
Really, it's no biggie. I move between both LHD and RHD all the time.
And, just to add some trivia: we drive our trains on the left track from the left side of the train. (I'm a train driver!)
I know your question was in relation to modern cars but just some trivia, most early, teens, 20's cars that had been converted to RHD, had the foot throttle peddle in between the clutch and brake peddles, no room for it hard right.
We had Post Office Jeeps back in the 70's that could be converted to Rt. or Lft. drive. Removeable plates in the floor allowed the steering column brake and accelerator to be shifted over but their positions, (brake left, accelerator right), remained the same. Gear shift (automatic) and turn signal lever stayed in the same position on the column too. Most were delivered as RHD.
Don't know what cars you are specifically talking about but most early 1910-1920 RHD cars came with the accelerator between the clutch and brake pedal. It had nothing to do with the amount of room they just hadn't got to the stage where the right side accelerator was to be on the right of the brake.
It had a lot to do with room, all my chev's 25,2x27's and a 29 roadster, my 27 studie, 2x 27 essex, dodge, all had the same problem, the brake peddle was against the kick board, no room for the throttle peddle so, are in the middle.
If you go back further even bodies without doors had the same layout,
As the accelerator was in the middle the body was probably bought in to the left to make it more streamlined.