A **bus lane** is a part of the road reserved exclusively for the use of buses and, in some cases, taxis or bicycles. According to traffic regulations, it is **prohibited to stop or park** in lanes or areas reserved for other vehicles, such as bus lanes. This is because obstructing these lanes can interfere with public transport and cause traffic problems.

On the other hand, although **double parking** is not ideal and can be dangerous, it is not completely prohibited. Stopping is allowed, but not parking, in double parking as long as the driver remains in the vehicle and does not cause significant obstructions.

As for the **designated parking areas**, they are specifically designed for vehicles to stop and park safely and orderly, so there are no general restrictions for doing so in these places.

Therefore, the correct answer is that you cannot stop in a **bus lane**.