Description word: those are not easy

The reasons why the stresses on near side wheels are greater than those on the off-side (on UK rural roads).

This is a sentence from a past paper exam that I don't understand and I need your help to understand some phrases like "near side wheels" and "off-side".

Thanks to all of you

Near-side wheel should be closer to something, while thw off-side wheel is farther away from that same thing. Perhaps to the steering wheel? - But you would need to figure it out from the context.