Crossing the border

If I remember correctly, the signs direct commercial trucks and traffic to the right and the truck lanes go around (to the west of) the custom office building to special truck lanes.

The lane directly to the left (east side) of the office building is usually marked "buses only". The remainder of the lanes to the left of the bus lane are usually marked Car/RV, although sometimes the lanes all the way to the left are marked cars only - no trailers.

Hope that is some help. ....

The far right lane

I agree. I have crossed several times from Ontario to the US. We have used several border crossings. All have been well marked. Usually to the right & will be marked rv/car. I worried the first couple of times but is a non issue.

There are signs, just go slow and read carefully. When we went through there were truck signs (stay out of those), RV / Cars and cars only.

Generally keep to the right. Look ahead and there should be either signs or lights to advise you.