To overtake a vehicle on the **right** on a road, there are certain specific conditions that must be met. One of these conditions is that overtaking on the right is allowed **within built-up areas** when the roadway has at least **two lanes in the same direction** and these are **marked by white lines** on the ground. This means that in urban areas, where streets often have multiple well-marked lanes, it is possible to overtake on the right if these conditions are met.

On the other hand, outside of these specific situations, overtaking is generally done on the **left**. This is to ensure safety and the orderly flow of traffic. Therefore, the correct answer is that you can overtake on the right, but only when the lanes are marked and the road is within a built-up area.